# Is Квант the actual source of this problem?

If I recall correctly, Andreescu & Andrica attributed the olympiad problem which prompted this question by S. Pek to the Russian magazine Kvant. Does anybody here know if the problem actually appeared in the pages of Kvant once?

Hope this question of mine doesn't get closed... I dared to ask it here because I believe that several MO users were avid readers of Kvant back in the day.

Yes, it is problem M618a), published in No. 4, 1980. Part b) claimed that for every $\alpha>0$ there exist infinitely many $n$ with $n^2+1\mid [\alpha n]!$. The problem is attributed to A. Sivatsky (who was a 10th grade student at that time).