OFFSET
1,1
COMMENTS
These are all squares. Square roots are in A325312.
LINKS
FORMULA
a(n) = A325312(n)^2. - Amiram Eldar, Apr 05 2024
MATHEMATICA
Select[Range[1, 7755, 2]^2, Mod[(s = DivisorSigma[1, #]), 4] == 3 && s > 2*# &] (* Amiram Eldar, Apr 05 2024 *)
PROG
(PARI) isA325311(n) = (n%2 && (3==sigma(n)%4) && sigma(n)>(2*n));
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Apr 20 2019
STATUS
approved