OFFSET
1,2
COMMENTS
A225245(a(n)) > 0.
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..1000
MATHEMATICA
f[n_] := f[n] = Coefficient[Product[If[MoebiusMu[d] != 0, 1 + x^d, 1], {d, Divisors[n]}], x, n];
ParallelTable[If[f[k] > 0, k, Nothing], {k, 1, 1000}] (* Jean-François Alcover, May 04 2024, after Ilya Gutkovskiy in A225245 *)
PROG
(Haskell)
import Data.List (findIndices)
a225354 n = a225354_list !! (n-1)
a225354_list = map (+ 1) $ findIndices (> 0) a225245_list
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, May 05 2013
STATUS
approved