perplexus.info :: Just Math : A multiple of 42

A multiple of 42 (Posted on 2022-03-23)

Prove that
n^7-n
is divisible by 42
for any integer n.

Submitted by Ady TZIDON

Rating: 5.0000 (1 votes)

Solution: (Hide)

March 25, 2022 All solvers provided their correct proofs, based either on Fermat or on mathematical induction. I see no need to add anything.

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
re(2): Puzzle Solution technical hint @ KS	K Sengupta	2022-03-25 08:17:23
re: Puzzle Solution technical hint @ KS	Ady TZIDON	2022-03-25 04:28:22
Possible Solution	broll	2022-03-23 23:25:10
solution	Charlie	2022-03-23 08:57:13
Puzzle Solution	K Sengupta	2022-03-23 08:29:54
Observation, not necessarily a proof	Larry	2022-03-23 08:23:12

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