MathDB

57

Part of PEN A Problems

Problems(1)

A 57

Source:

5/25/2007
Prove that for every n∈Nn \in \mathbb{N} the following proposition holds: 7∣3n+n37|3^n +n^3 if and only if 7∣3nn3+17|3^{n} n^3 +1.
Divisibility Theory