Mathematical and Physical Journal
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Problem C. 1273. (February 2015)

C. 1273. Prove that \(\displaystyle 3^{4n}+4\cdot 7^{4k}\) is divisible by 5 for all \(\displaystyle n,k\in \mathbb{N}\).

(5 pont)

Deadline expired on March 10, 2015.


144 students sent a solution.
5 points:54 students.
4 points:45 students.
3 points:37 students.
2 points:5 students.
1 point:1 student.
0 point:2 students.

Problems in Mathematics of KöMaL, February 2015