A132349 If n is a k-th power with k >= 2 then a(n) = k, otherwise a(n) = 0.

0, 0, 0, 2, 0, 0, 0, 3, 2, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 3, 0, 0, 0, 0, 5, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2

Offset

1,4

Links

Antti Karttunen, Table of n, a(n) for n = 1..10000

Prog

(PARI) r(n) = for(j=1, n, print1(ispower(j)", ")); r(100)

Crossrefs

Cf. A132384-A132352.

Sequence in context: A355524 A113503 A082507 * A216226 A123391 A212172

Adjacent sequences: A132346 A132347 A132348 * A132350 A132351 A132352

Keyword

nonn

Author

N. J. A. Sloane, Nov 11 2007

Status

approved