OFFSET
1,1
COMMENTS
The larger counterparts are in A348344.
MATHEMATICA
f[p_, e_] := Module[{b = IntegerDigits[e, 2], m}, m = Length[b]; Product[If[b[[j]] > 0, 1 + p^(2^(m - j)), 1], {j, 1, m}]]; isigma[1] = 1; isigma[n_] := Times @@ f @@@ FactorInteger[n]; s[n_] := DivisorSigma[1, n] - isigma[n]; seq={}; Do[m=s[n]; If[m>n && s[m]==n, AppendTo[seq, n]], {n, 1, 10^4}]; seq
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Amiram Eldar, Oct 13 2021
STATUS
approved