OFFSET
1,1
LINKS
R. Zumkeller, Table of n, a(n) for n = 1..10000
Eric Weisstein's World of Mathematics, Divisor Function
MATHEMATICA
aQ[n_] := Divisible[DivisorSigma[0, n] - 1, PrimeNu[n]]; Select[Range[2, 193], aQ] (* Amiram Eldar, Aug 31 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Feb 24 2008
STATUS
approved