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Problem 517


Problem 517


A real recursion

For every real number a>1 is given the sequence ga by:

ga(x)=1 for x<a

ga(x)=ga(x1)+ga(xa) for xa

G(n)=gn(n)

G(90)=7564511.

Find ΣG(p) for p prime and 10000000<p<10010000

Give your answer modulo 1000000007.


实数递归

对于任意实数a>1,我们可以根据以下规则写出序列ga

x<a,则ga(x)=1

xa,则ga(x)=ga(x1)+ga(xa)

G(n)=gn(n)

已知G(90)=7564511

对于所有素数10000000<p<10010000,求ΣG(p)

将其模1000000007取余作为你的答案。


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