OFFSET
1,2
COMMENTS
First differs from A053460 at n = 39.
Giovanni Resta found that 1003 is the largest number that is not a sum of admirable numbers.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..504 (complete sequence)
Giovanni Resta, admirable numbers, Numbers Aplenty.
MATHEMATICA
admQ[n_] := (ab = DivisorSigma[1, n] - 2 n) > 0 && EvenQ[ab] && ab/2 < n && Divisible[n, ab/2];
With[{adm = Select[Range[1200], admQ]}, Position[Rest[CoefficientList[Series[Product[(1 + x^adm[[k]]), {k, 1, Length[adm]}], {x, 0, adm[[-1]]}], x]], 0] // Flatten]
CROSSREFS
KEYWORD
nonn,fini,full
AUTHOR
Amiram Eldar, Aug 05 2023
STATUS
approved