OFFSET
1,1
COMMENTS
EXAMPLE
15 is a term: its prime factors are 3 and 5; 3 == 3 (mod 4), 5 == 1 (mod 4).
MATHEMATICA
Select[Range[1, 351, 2], Length[Union[Mod[FactorInteger[#][[;; , 1]], 4]]] == 2 &] (* Amiram Eldar, Aug 28 2022 *)
PROG
(PARI) isok(m) = if (m % 2, my(vf=factor(m)[, 1]); (#select(x->((x%4)==1), vf) >= 1) && (#select(x->((x%4)==3), vf) >= 1)); \\ Michel Marcus, Aug 29 2022
CROSSREFS
KEYWORD
nonn
AUTHOR
Jon E. Schoenfield, Aug 27 2022
STATUS
approved