Mathematical and Physical Journal
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Problem B. 4761. (January 2016)

B. 4761. Let \(\displaystyle n\) be an integer greater than 3. Prove that if each digit occurs exactly once in the base-\(\displaystyle n\) representation of an integer then the number cannot be a prime.

Proposed by Z. Halasi, Csobánka

(4 pont)

Deadline expired on February 10, 2016.


122 students sent a solution.
4 points:79 students.
3 points:28 students.
2 points:11 students.
1 point:2 students.
0 point:2 students.

Problems in Mathematics of KöMaL, January 2016