If x is a prime number，y is&nb

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If x is a prime number，y is an integer，and x^21-x=2

∵y是整数，
∴y²一定是合数，
∴y²+3一定是质数，
而x^21-x=2y2+3，
∴x=2，
∴21-x=y²+3，
∴y²=16，
∴xy²=2×16=32．
故选C．

If x is a prime number，y is&nb A &nb 短文填空 Wei Fang is twelve y &nb Hainan is （ If n is a positive integer，and ( ) ( ) 3 &nb is no possibility If the n-th prime &nbs 短文填空 That is a —________?—He is a computer engineer.&nb Tom is 1.1 metres tall. Jenny is&nb three angles are given as X,X,Y.&nb