1,2

(PARI) for(n=1, 10^5, if(issquare(sigma(n, 3)), print(n)))

Cf. A001158.

Adjacent sequences: A063828 A063829 A063830 this_sequence A063832 A063833 A063834

Sequence in context: A057626 A063968 A064501 this_sequence A064023 A024350 A012669

more,nonn

Jason Earls (zevi_35711(AT)yahoo.com), Aug 21 2001

More terms from Thomas Baruchel (baruchel(AT)users.sourceforge.net), Oct 20 2003