A174898 a(n) = characteristic function of numbers k such that A007955(m) = k has no solution for any m, where A007955(m) = product of divisors of m.

0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1

Offset

1,1

Comments

a(n) = characteristic function of numbers from A174896(n).

a(n) = 1 if A007955(m) not equal to n for any m, else 0.

Links

Antti Karttunen, Table of n, a(n) for n = 1..20000 (computed from the b-file of A174897)

Index entries for characteristic functions

Formula

a(n) = 1 - A174897(n).

Crossrefs

Cf. A007955, A174896, A174897.

Sequence in context: A288377 A341609 A064911 * A099618 A361496 A360125

Adjacent sequences: A174895 A174896 A174897 * A174899 A174900 A174901

Keyword

nonn

Author

Jaroslav Krizek, Apr 01 2010

Extensions

More terms from Antti Karttunen, Oct 20 2017

Status

approved