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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. 4
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 (list; graph; refs; listen; history; text; internal format)
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: A072783 A288377 A064911 * A099618 A324883 A106002

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

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Last modified February 16 21:37 EST 2020. Contains 331975 sequences. (Running on oeis4.)