OFFSET
1,1
COMMENTS
MATHEMATICA
ad[1] = 0; ad[n_] := n * Total@(Last[#]/First[#]& /@ FactorInteger[n]); Select[Range[1, 1501, 2], ad[DivisorSigma[1, #^2]] > #^2 &] (* Amiram Eldar, Sep 18 2021 *)
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Sep 18 2021
STATUS
approved