OFFSET
1,2
COMMENTS
A076078(n) = the number of sets of distinct positive integers with a least common multiple of n.
All powers of 2 are in the sequence. - Robert G. Wilson v, Aug 14 2004
MATHEMATICA
f[n_] := Block[{d = Divisors[n]}, Plus @@ (MoebiusMu[n/d](2^DivisorSigma[0, d] - 1))]; Take[ Union[ Table[ f[n], {n, 2^20}]], 42] (* Robert G. Wilson v, Aug 14 2004 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Matthew Vandermast, Aug 01 2004
STATUS
approved