OFFSET
1,2
COMMENTS
MATHEMATICA
ad[1] = 0; ad[n_] := n * Total@(Last[#]/First[#]& /@ FactorInteger[n]); Select[Range[115], EvenQ[ad[DivisorSigma[1, #]]] &] (* Amiram Eldar, Sep 19 2021 *)
PROG
(PARI) isA347878(n) = !A347870(n);
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Sep 19 2021
STATUS
approved