OFFSET
1,1
COMMENTS
Odd terms exist (e.g., 349476304574870948475). What is the smallest odd term?
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
EXAMPLE
3600 is a term since the sum of the noninfinitary divisors of 3600 is A348271(3600) = 8073 > 2*3600 = 7200.
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]; Select[Range[10^5], s[#] > 2*# &]
CROSSREFS
KEYWORD
nonn
AUTHOR
Amiram Eldar, Oct 21 2021
STATUS
approved