A174898 - OEIS

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

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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