Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
Already signed up?
New to KöMaL?
I want the old design back!!! :-)

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.
1 point:2 students.
0 point:2 students.

Problems in Mathematics of KöMaL, March 2005