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2*a^2+2*b*5^4+a*5^4-a-2ab=0
20整数解
a = -585000, b = -584064
a = -116500, b = -115568
a = -22800, b = -21888
a = -4060, b = -3248
a = -312, b = 0
a = 0, b = 0
a = 500, b = -3248
a = 600, b = -21888
a = 620, b = -115568
a = 624, b = -584064
a = 626, b = 587188
a = 630, b = 118692
a = 650, b = 25012
a = 750, b = 6372
a = 1250, b = 3124
a = 1562, b = 3124
a = 5310, b = 6372
a = 24050, b = 25012
a = 117750, b = 118692
a = 586250, b = 587188
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