OFFSET
1,18
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
Eric Weisstein's World of Mathematics, Abundant Number.
MATHEMATICA
f[n_] := Boole[Count[Divisors[n], _?(DivisorSigma[1, #] > 2 # &)] == 1]; Accumulate @ Array[f, 100] (* Amiram Eldar, Mar 21 2021 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Dec 27 2003
STATUS
approved