A338520 - OEIS

1, 6, 12, 28, 30, 56, 72, 117, 120, 132, 180, 182, 306, 360, 380, 496, 552, 672, 702, 775, 792, 840, 870, 992, 1080, 1092, 1406, 1440, 1568, 1584, 1680, 1722, 1836, 1892, 2016, 2160, 2184, 2256, 2280, 2793, 2862, 3276, 3312, 3510, 3540, 3600, 3672, 3696, 3782, 3960

COMMENTS

Integers m such that A327153(m) = 1.

PROG

(PARI) f(n) = sumdiv(n, d, d*sigma(d)==n); \\ A327153

isok(n) = f(n)==1;

CROSSREFS

Subsequences: A000396 (perfect numbers), A036690 (p*(p+1)).

Cf. A338519 (similar for number of divisors).