OFFSET
1,2
LINKS
Donovan Johnson, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Range[200000], Divisible[#^2, DivisorSigma[1, #]] &] (* Amiram Eldar, May 09 2022 *)
PROG
(PARI) for (n=1, 10^6, if ( n^2 % sigma(n) ==0, print1(n, ", "))); /* Joerg Arndt, May 28 2012 */
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Feb 08 2004
STATUS
approved