OFFSET
1,2
COMMENTS
Numbers k for which A001065(k) = 4*m for some m.
MATHEMATICA
Select[Range[300], Divisible[DivisorSigma[1, #] - #, 4] &] (* Amiram Eldar, May 16 2022 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, May 16 2022
STATUS
approved