Mathematical and Physical Journal
for High Schools
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Problem A. 369. (March 2005)

A. 369. Find those positive integers n for which

\sigma(n!)=\frac{(n+1)!}{2}

holds.

(5 pont)

Deadline expired on April 15, 2005.

Statistics:

9 students sent a solution.
5 points: Estélyi István, Jankó Zsuzsanna, Paulin Roland, Strenner Balázs, Tomon István(5 students).
1 point: 2 students.
0 points: 2 students.

Problems in Mathematics of KöMaL, March 2005