Posted by
**Bob** on
.

Let N be the sum of all positive integers q of the form q=p^k with prime p, such that for at least four different integer values of x from 1 to q,

x^3−3x≡123(modq).

What are the last 3 digits of N?

Sunday

March 26, 2017
Posted by
**Bob** on
.

Let N be the sum of all positive integers q of the form q=p^k with prime p, such that for at least four different integer values of x from 1 to q,

x^3−3x≡123(modq).

What are the last 3 digits of N?

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