48994400≤a2−a⁢b+b2≤48994499 であるアイゼンシュタイン整数 a+b⁢ω の分類
a+b⁢ω分類a2−a⁢b+b2
7216+455⁢ω6761+7216⁢ω−455+7216⁢ω−7216−455⁢ω−6761−7216⁢ω455−7216⁢ω合成数48994401
7664+1609⁢ω6055+7664⁢ω−1609+7664⁢ω−7664−1609⁢ω−6055−7664⁢ω1609−7664⁢ω合成数48994401
7715+1771⁢ω5944+7715⁢ω−1771+7715⁢ω−7715−1771⁢ω−5944−7715⁢ω1771−7715⁢ω合成数48994401
7981+2885⁢ω5096+7981⁢ω−2885+7981⁢ω−7981−2885⁢ω−5096−7981⁢ω2885−7981⁢ω合成数48994401
7981+5096⁢ω2885+7981⁢ω−5096+7981⁢ω−7981−5096⁢ω−2885−7981⁢ω5096−7981⁢ω合成数48994401
7715+5944⁢ω1771+7715⁢ω−5944+7715⁢ω−7715−5944⁢ω−1771−7715⁢ω5944−7715⁢ω合成数48994401
7664+6055⁢ω1609+7664⁢ω−6055+7664⁢ω−7664−6055⁢ω−1609−7664⁢ω6055−7664⁢ω合成数48994401
7216+6761⁢ω455+7216⁢ω−6761+7216⁢ω−7216−6761⁢ω−455−7216⁢ω6761−7216⁢ω合成数48994401
8067+3601⁢ω4466+8067⁢ω−3601+8067⁢ω−8067−3601⁢ω−4466−8067⁢ω3601−8067⁢ω素数48994423
8067+4466⁢ω3601+8067⁢ω−4466+8067⁢ω−8067−4466⁢ω−3601−8067⁢ω4466−8067⁢ω素数48994423
7052+106⁢ω6946+7052⁢ω−106+7052⁢ω−7052−106⁢ω−6946−7052⁢ω106−7052⁢ω合成数48994428
8014+3098⁢ω4916+8014⁢ω−3098+8014⁢ω−8014−3098⁢ω−4916−8014⁢ω3098−8014⁢ω合成数48994428
8014+4916⁢ω3098+8014⁢ω−4916+8014⁢ω−8014−4916⁢ω−3098−8014⁢ω4916−8014⁢ω合成数48994428
7052+6946⁢ω106+7052⁢ω−6946+7052⁢ω−7052−6946⁢ω−106−7052⁢ω6946−7052⁢ω合成数48994428
7703+1732⁢ω5971+7703⁢ω−1732+7703⁢ω−7703−1732⁢ω−5971−7703⁢ω1732−7703⁢ω合成数48994437
7907+2503⁢ω5404+7907⁢ω−2503+7907⁢ω−7907−2503⁢ω−5404−7907⁢ω2503−7907⁢ω合成数48994437
7907+5404⁢ω2503+7907⁢ω−5404+7907⁢ω−7907−5404⁢ω−2503−7907⁢ω5404−7907⁢ω合成数48994437
7703+5971⁢ω1732+7703⁢ω−5971+7703⁢ω−7703−5971⁢ω−1732−7703⁢ω5971−7703⁢ω合成数48994437
7325+704⁢ω6621+7325⁢ω−704+7325⁢ω−7325−704⁢ω−6621−7325⁢ω704−7325⁢ω合成数48994441
7599+1415⁢ω6184+7599⁢ω−1415+7599⁢ω−7599−1415⁢ω−6184−7599⁢ω1415−7599⁢ω合成数48994441
7599+6184⁢ω1415+7599⁢ω−6184+7599⁢ω−7599−6184⁢ω−1415−7599⁢ω6184−7599⁢ω合成数48994441
7325+6621⁢ω704+7325⁢ω−6621+7325⁢ω−7325−6621⁢ω−704−7325⁢ω6621−7325⁢ω合成数48994441
7722+1794⁢ω5928+7722⁢ω−1794+7722⁢ω−7722−1794⁢ω−5928−7722⁢ω1794−7722⁢ω合成数48994452
7806+2088⁢ω5718+7806⁢ω−2088+7806⁢ω−7806−2088⁢ω−5718−7806⁢ω2088−7806⁢ω合成数48994452
7944+2682⁢ω5262+7944⁢ω−2682+7944⁢ω−7944−2682⁢ω−5262−7944⁢ω2682−7944⁢ω合成数48994452
7944+5262⁢ω2682+7944⁢ω−5262+7944⁢ω−7944−5262⁢ω−2682−7944⁢ω5262−7944⁢ω合成数48994452
7806+5718⁢ω2088+7806⁢ω−5718+7806⁢ω−7806−5718⁢ω−2088−7806⁢ω5718−7806⁢ω合成数48994452
7722+5928⁢ω1794+7722⁢ω−5928+7722⁢ω−7722−5928⁢ω−1794−7722⁢ω5928−7722⁢ω合成数48994452
7996+2977⁢ω5019+7996⁢ω−2977+7996⁢ω−7996−2977⁢ω−5019−7996⁢ω2977−7996⁢ω合成数48994453
8031+3227⁢ω4804+8031⁢ω−3227+8031⁢ω−8031−3227⁢ω−4804−8031⁢ω3227−8031⁢ω合成数48994453
8031+4804⁢ω3227+8031⁢ω−4804+8031⁢ω−8031−4804⁢ω−3227−8031⁢ω4804−8031⁢ω合成数48994453
7996+5019⁢ω2977+7996⁢ω−5019+7996⁢ω−7996−5019⁢ω−2977−7996⁢ω5019−7996⁢ω合成数48994453
8058+3485⁢ω4573+8058⁢ω−3485+8058⁢ω−8058−3485⁢ω−4573−8058⁢ω3485−8058⁢ω合成数48994459
8058+4573⁢ω3485+8058⁢ω−4573+8058⁢ω−8058−4573⁢ω−3485−8058⁢ω4573−8058⁢ω合成数48994459
7486+1104⁢ω6382+7486⁢ω−1104+7486⁢ω−7486−1104⁢ω−6382−7486⁢ω1104−7486⁢ω合成数48994468
7814+2118⁢ω5696+7814⁢ω−2118+7814⁢ω−7814−2118⁢ω−5696−7814⁢ω2118−7814⁢ω合成数48994468
7814+5696⁢ω2118+7814⁢ω−5696+7814⁢ω−7814−5696⁢ω−2118−7814⁢ω5696−7814⁢ω合成数48994468
7486+6382⁢ω1104+7486⁢ω−6382+7486⁢ω−7486−6382⁢ω−1104−7486⁢ω6382−7486⁢ω合成数48994468
7447+1003⁢ω6444+7447⁢ω−1003+7447⁢ω−7447−1003⁢ω−6444−7447⁢ω1003−7447⁢ω合成数48994477
7737+1844⁢ω5893+7737⁢ω−1844+7737⁢ω−7737−1844⁢ω−5893−7737⁢ω1844−7737⁢ω合成数48994477
8052+3419⁢ω4633+8052⁢ω−3419+8052⁢ω−8052−3419⁢ω−4633−8052⁢ω3419−8052⁢ω合成数48994477
8081+3908⁢ω4173+8081⁢ω−3908+8081⁢ω−8081−3908⁢ω−4173−8081⁢ω3908−8081⁢ω合成数48994477
8081+4173⁢ω3908+8081⁢ω−4173+8081⁢ω−8081−4173⁢ω−3908−8081⁢ω4173−8081⁢ω合成数48994477
8052+4633⁢ω3419+8052⁢ω−4633+8052⁢ω−8052−4633⁢ω−3419−8052⁢ω4633−8052⁢ω合成数48994477
7737+5893⁢ω1844+7737⁢ω−5893+7737⁢ω−7737−5893⁢ω−1844−7737⁢ω5893−7737⁢ω合成数48994477
7447+6444⁢ω1003+7447⁢ω−6444+7447⁢ω−7447−6444⁢ω−1003−7447⁢ω6444−7447⁢ω合成数48994477
7647+1557⁢ω6090+7647⁢ω−1557+7647⁢ω−7647−1557⁢ω−6090−7647⁢ω1557−7647⁢ω合成数48994479
7647+6090⁢ω1557+7647⁢ω−6090+7647⁢ω−7647−6090⁢ω−1557−7647⁢ω6090−7647⁢ω合成数48994479
8009+3063⁢ω4946+8009⁢ω−3063+8009⁢ω−8009−3063⁢ω−4946−8009⁢ω3063−8009⁢ω合成数48994483
8046+3359⁢ω4687+8046⁢ω−3359+8046⁢ω−8046−3359⁢ω−4687−8046⁢ω3359−8046⁢ω合成数48994483
8046+4687⁢ω3359+8046⁢ω−4687+8046⁢ω−8046−4687⁢ω−3359−8046⁢ω4687−8046⁢ω合成数48994483
8009+4946⁢ω3063+8009⁢ω−4946+8009⁢ω−8009−4946⁢ω−3063−8009⁢ω4946−8009⁢ω合成数48994483
7752+1895⁢ω5857+7752⁢ω−1895+7752⁢ω−7752−1895⁢ω−5857−7752⁢ω1895−7752⁢ω合成数48994489
8027+3195⁢ω4832+8027⁢ω−3195+8027⁢ω−8027−3195⁢ω−4832−8027⁢ω3195−8027⁢ω合成数48994489
8027+4832⁢ω3195+8027⁢ω−4832+8027⁢ω−8027−4832⁢ω−3195−8027⁢ω4832−8027⁢ω合成数48994489
7752+5857⁢ω1895+7752⁢ω−5857+7752⁢ω−7752−5857⁢ω−1895−7752⁢ω5857−7752⁢ω合成数48994489
7512+1173⁢ω6339+7512⁢ω−1173+7512⁢ω−7512−1173⁢ω−6339−7512⁢ω1173−7512⁢ω合成数48994497
7512+6339⁢ω1173+7512⁢ω−6339+7512⁢ω−7512−6339⁢ω−1173−7512⁢ω6339−7512⁢ω合成数48994497
48994400≤a2−a⁢b+b2≤48994499 であるアイゼンシュタイン整数 a+b⁢ω の分類
a+b⁢ω分類a2−a⁢b+b2
7216+455⁢ω合成数48994401
7664+1609⁢ω合成数48994401
7715+1771⁢ω合成数48994401
7981+2885⁢ω合成数48994401
7981+5096⁢ω合成数48994401
7715+5944⁢ω合成数48994401
7664+6055⁢ω合成数48994401
7216+6761⁢ω合成数48994401
6761+7216⁢ω合成数48994401
6055+7664⁢ω合成数48994401
5944+7715⁢ω合成数48994401
5096+7981⁢ω合成数48994401
2885+7981⁢ω合成数48994401
1771+7715⁢ω合成数48994401
1609+7664⁢ω合成数48994401
455+7216⁢ω合成数48994401
−455+7216⁢ω合成数48994401
−1609+7664⁢ω合成数48994401
−1771+7715⁢ω合成数48994401
−2885+7981⁢ω合成数48994401
−5096+7981⁢ω合成数48994401
−5944+7715⁢ω合成数48994401
−6055+7664⁢ω合成数48994401
−6761+7216⁢ω合成数48994401
−7216−455⁢ω合成数48994401
−7664−1609⁢ω合成数48994401
−7715−1771⁢ω合成数48994401
−7981−2885⁢ω合成数48994401
−7981−5096⁢ω合成数48994401
−7715−5944⁢ω合成数48994401
−7664−6055⁢ω合成数48994401
−7216−6761⁢ω合成数48994401
−6761−7216⁢ω合成数48994401
−6055−7664⁢ω合成数48994401
−5944−7715⁢ω合成数48994401
−5096−7981⁢ω合成数48994401
−2885−7981⁢ω合成数48994401
−1771−7715⁢ω合成数48994401
−1609−7664⁢ω合成数48994401
−455−7216⁢ω合成数48994401
455−7216⁢ω合成数48994401
1609−7664⁢ω合成数48994401
1771−7715⁢ω合成数48994401
2885−7981⁢ω合成数48994401
5096−7981⁢ω合成数48994401
5944−7715⁢ω合成数48994401
6055−7664⁢ω合成数48994401
6761−7216⁢ω合成数48994401
8067+3601⁢ω素数48994423
8067+4466⁢ω素数48994423
4466+8067⁢ω素数48994423
3601+8067⁢ω素数48994423
−3601+8067⁢ω素数48994423
−4466+8067⁢ω素数48994423
−8067−3601⁢ω素数48994423
−8067−4466⁢ω素数48994423
−4466−8067⁢ω素数48994423
−3601−8067⁢ω素数48994423
3601−8067⁢ω素数48994423
4466−8067⁢ω素数48994423
7052+106⁢ω合成数48994428
8014+3098⁢ω合成数48994428
8014+4916⁢ω合成数48994428
7052+6946⁢ω合成数48994428
6946+7052⁢ω合成数48994428
4916+8014⁢ω合成数48994428
3098+8014⁢ω合成数48994428
106+7052⁢ω合成数48994428
−106+7052⁢ω合成数48994428
−3098+8014⁢ω合成数48994428
−4916+8014⁢ω合成数48994428
−6946+7052⁢ω合成数48994428
−7052−106⁢ω合成数48994428
−8014−3098⁢ω合成数48994428
−8014−4916⁢ω合成数48994428
−7052−6946⁢ω合成数48994428
−6946−7052⁢ω合成数48994428
−4916−8014⁢ω合成数48994428
−3098−8014⁢ω合成数48994428
−106−7052⁢ω合成数48994428
106−7052⁢ω合成数48994428
3098−8014⁢ω合成数48994428
4916−8014⁢ω合成数48994428
6946−7052⁢ω合成数48994428
7703+1732⁢ω合成数48994437
7907+2503⁢ω合成数48994437
7907+5404⁢ω合成数48994437
7703+5971⁢ω合成数48994437
5971+7703⁢ω合成数48994437
5404+7907⁢ω合成数48994437
2503+7907⁢ω合成数48994437
1732+7703⁢ω合成数48994437
−1732+7703⁢ω合成数48994437
−2503+7907⁢ω合成数48994437
−5404+7907⁢ω合成数48994437
−5971+7703⁢ω合成数48994437
−7703−1732⁢ω合成数48994437
−7907−2503⁢ω合成数48994437
−7907−5404⁢ω合成数48994437
−7703−5971⁢ω合成数48994437
−5971−7703⁢ω合成数48994437
−5404−7907⁢ω合成数48994437
−2503−7907⁢ω合成数48994437
−1732−7703⁢ω合成数48994437
1732−7703⁢ω合成数48994437
2503−7907⁢ω合成数48994437
5404−7907⁢ω合成数48994437
5971−7703⁢ω合成数48994437
7325+704⁢ω合成数48994441
7599+1415⁢ω合成数48994441
7599+6184⁢ω合成数48994441
7325+6621⁢ω合成数48994441
6621+7325⁢ω合成数48994441
6184+7599⁢ω合成数48994441
1415+7599⁢ω合成数48994441
704+7325⁢ω合成数48994441
−704+7325⁢ω合成数48994441
−1415+7599⁢ω合成数48994441
−6184+7599⁢ω合成数48994441
−6621+7325⁢ω合成数48994441
−7325−704⁢ω合成数48994441
−7599−1415⁢ω合成数48994441
−7599−6184⁢ω合成数48994441
−7325−6621⁢ω合成数48994441
−6621−7325⁢ω合成数48994441
−6184−7599⁢ω合成数48994441
−1415−7599⁢ω合成数48994441
−704−7325⁢ω合成数48994441
704−7325⁢ω合成数48994441
1415−7599⁢ω合成数48994441
6184−7599⁢ω合成数48994441
6621−7325⁢ω合成数48994441
7722+1794⁢ω合成数48994452
7806+2088⁢ω合成数48994452
7944+2682⁢ω合成数48994452
7944+5262⁢ω合成数48994452
7806+5718⁢ω合成数48994452
7722+5928⁢ω合成数48994452
5928+7722⁢ω合成数48994452
5718+7806⁢ω合成数48994452
5262+7944⁢ω合成数48994452
2682+7944⁢ω合成数48994452
2088+7806⁢ω合成数48994452
1794+7722⁢ω合成数48994452
−1794+7722⁢ω合成数48994452
−2088+7806⁢ω合成数48994452
−2682+7944⁢ω合成数48994452
−5262+7944⁢ω合成数48994452
−5718+7806⁢ω合成数48994452
−5928+7722⁢ω合成数48994452
−7722−1794⁢ω合成数48994452
−7806−2088⁢ω合成数48994452
−7944−2682⁢ω合成数48994452
−7944−5262⁢ω合成数48994452
−7806−5718⁢ω合成数48994452
−7722−5928⁢ω合成数48994452
−5928−7722⁢ω合成数48994452
−5718−7806⁢ω合成数48994452
−5262−7944⁢ω合成数48994452
−2682−7944⁢ω合成数48994452
−2088−7806⁢ω合成数48994452
−1794−7722⁢ω合成数48994452
1794−7722⁢ω合成数48994452
2088−7806⁢ω合成数48994452
2682−7944⁢ω合成数48994452
5262−7944⁢ω合成数48994452
5718−7806⁢ω合成数48994452
5928−7722⁢ω合成数48994452
7996+2977⁢ω合成数48994453
8031+3227⁢ω合成数48994453
8031+4804⁢ω合成数48994453
7996+5019⁢ω合成数48994453
5019+7996⁢ω合成数48994453
4804+8031⁢ω合成数48994453
3227+8031⁢ω合成数48994453
2977+7996⁢ω合成数48994453
−2977+7996⁢ω合成数48994453
−3227+8031⁢ω合成数48994453
−4804+8031⁢ω合成数48994453
−5019+7996⁢ω合成数48994453
−7996−2977⁢ω合成数48994453
−8031−3227⁢ω合成数48994453
−8031−4804⁢ω合成数48994453
−7996−5019⁢ω合成数48994453
−5019−7996⁢ω合成数48994453
−4804−8031⁢ω合成数48994453
−3227−8031⁢ω合成数48994453
−2977−7996⁢ω合成数48994453
2977−7996⁢ω合成数48994453
3227−8031⁢ω合成数48994453
4804−8031⁢ω合成数48994453
5019−7996⁢ω合成数48994453
8058+3485⁢ω合成数48994459
8058+4573⁢ω合成数48994459
4573+8058⁢ω合成数48994459
3485+8058⁢ω合成数48994459
−3485+8058⁢ω合成数48994459
−4573+8058⁢ω合成数48994459
−8058−3485⁢ω合成数48994459
−8058−4573⁢ω合成数48994459
−4573−8058⁢ω合成数48994459
−3485−8058⁢ω合成数48994459
3485−8058⁢ω合成数48994459
4573−8058⁢ω合成数48994459
7486+1104⁢ω合成数48994468
7814+2118⁢ω合成数48994468
7814+5696⁢ω合成数48994468
7486+6382⁢ω合成数48994468
6382+7486⁢ω合成数48994468
5696+7814⁢ω合成数48994468
2118+7814⁢ω合成数48994468
1104+7486⁢ω合成数48994468
−1104+7486⁢ω合成数48994468
−2118+7814⁢ω合成数48994468
−5696+7814⁢ω合成数48994468
−6382+7486⁢ω合成数48994468
−7486−1104⁢ω合成数48994468
−7814−2118⁢ω合成数48994468
−7814−5696⁢ω合成数48994468
−7486−6382⁢ω合成数48994468
−6382−7486⁢ω合成数48994468
−5696−7814⁢ω合成数48994468
−2118−7814⁢ω合成数48994468
−1104−7486⁢ω合成数48994468
1104−7486⁢ω合成数48994468
2118−7814⁢ω合成数48994468
5696−7814⁢ω合成数48994468
6382−7486⁢ω合成数48994468
7447+1003⁢ω合成数48994477
7737+1844⁢ω合成数48994477
8052+3419⁢ω合成数48994477
8081+3908⁢ω合成数48994477
8081+4173⁢ω合成数48994477
8052+4633⁢ω合成数48994477
7737+5893⁢ω合成数48994477
7447+6444⁢ω合成数48994477
6444+7447⁢ω合成数48994477
5893+7737⁢ω合成数48994477
4633+8052⁢ω合成数48994477
4173+8081⁢ω合成数48994477
3908+8081⁢ω合成数48994477
3419+8052⁢ω合成数48994477
1844+7737⁢ω合成数48994477
1003+7447⁢ω合成数48994477
−1003+7447⁢ω合成数48994477
−1844+7737⁢ω合成数48994477
−3419+8052⁢ω合成数48994477
−3908+8081⁢ω合成数48994477
−4173+8081⁢ω合成数48994477
−4633+8052⁢ω合成数48994477
−5893+7737⁢ω合成数48994477
−6444+7447⁢ω合成数48994477
−7447−1003⁢ω合成数48994477
−7737−1844⁢ω合成数48994477
−8052−3419⁢ω合成数48994477
−8081−3908⁢ω合成数48994477
−8081−4173⁢ω合成数48994477
−8052−4633⁢ω合成数48994477
−7737−5893⁢ω合成数48994477
−7447−6444⁢ω合成数48994477
−6444−7447⁢ω合成数48994477
−5893−7737⁢ω合成数48994477
−4633−8052⁢ω合成数48994477
−4173−8081⁢ω合成数48994477
−3908−8081⁢ω合成数48994477
−3419−8052⁢ω合成数48994477
−1844−7737⁢ω合成数48994477
−1003−7447⁢ω合成数48994477
1003−7447⁢ω合成数48994477
1844−7737⁢ω合成数48994477
3419−8052⁢ω合成数48994477
3908−8081⁢ω合成数48994477
4173−8081⁢ω合成数48994477
4633−8052⁢ω合成数48994477
5893−7737⁢ω合成数48994477
6444−7447⁢ω合成数48994477
7647+1557⁢ω合成数48994479
7647+6090⁢ω合成数48994479
6090+7647⁢ω合成数48994479
1557+7647⁢ω合成数48994479
−1557+7647⁢ω合成数48994479
−6090+7647⁢ω合成数48994479
−7647−1557⁢ω合成数48994479
−7647−6090⁢ω合成数48994479
−6090−7647⁢ω合成数48994479
−1557−7647⁢ω合成数48994479
1557−7647⁢ω合成数48994479
6090−7647⁢ω合成数48994479
8009+3063⁢ω合成数48994483
8046+3359⁢ω合成数48994483
8046+4687⁢ω合成数48994483
8009+4946⁢ω合成数48994483
4946+8009⁢ω合成数48994483
4687+8046⁢ω合成数48994483
3359+8046⁢ω合成数48994483
3063+8009⁢ω合成数48994483
−3063+8009⁢ω合成数48994483
−3359+8046⁢ω合成数48994483
−4687+8046⁢ω合成数48994483
−4946+8009⁢ω合成数48994483
−8009−3063⁢ω合成数48994483
−8046−3359⁢ω合成数48994483
−8046−4687⁢ω合成数48994483
−8009−4946⁢ω合成数48994483
−4946−8009⁢ω合成数48994483
−4687−8046⁢ω合成数48994483
−3359−8046⁢ω合成数48994483
−3063−8009⁢ω合成数48994483
3063−8009⁢ω合成数48994483
3359−8046⁢ω合成数48994483
4687−8046⁢ω合成数48994483
4946−8009⁢ω合成数48994483
7752+1895⁢ω合成数48994489
8027+3195⁢ω合成数48994489
8027+4832⁢ω合成数48994489
7752+5857⁢ω合成数48994489
5857+7752⁢ω合成数48994489
4832+8027⁢ω合成数48994489
3195+8027⁢ω合成数48994489
1895+7752⁢ω合成数48994489
−1895+7752⁢ω合成数48994489
−3195+8027⁢ω合成数48994489
−4832+8027⁢ω合成数48994489
−5857+7752⁢ω合成数48994489
−7752−1895⁢ω合成数48994489
−8027−3195⁢ω合成数48994489
−8027−4832⁢ω合成数48994489
−7752−5857⁢ω合成数48994489
−5857−7752⁢ω合成数48994489
−4832−8027⁢ω合成数48994489
−3195−8027⁢ω合成数48994489
−1895−7752⁢ω合成数48994489
1895−7752⁢ω合成数48994489
3195−8027⁢ω合成数48994489
4832−8027⁢ω合成数48994489
5857−7752⁢ω合成数48994489
7512+1173⁢ω合成数48994497
7512+6339⁢ω合成数48994497
6339+7512⁢ω合成数48994497
1173+7512⁢ω合成数48994497
−1173+7512⁢ω合成数48994497
−6339+7512⁢ω合成数48994497
−7512−1173⁢ω合成数48994497
−7512−6339⁢ω合成数48994497
−6339−7512⁢ω合成数48994497
−1173−7512⁢ω合成数48994497
1173−7512⁢ω合成数48994497
6339−7512⁢ω合成数48994497