A175861 a(n) = characteristic function of numbers k such that A175856(m) = k has no solution for any m, where A175856(m): a(m) = m for m = noncomposites, a(m) = previous term - 1 for m = composites.

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

Offset: 1

Author

Jaroslav Krizek, Sep 29 2010

Keywords

• nonn

Comments

a(n) = characteristic function of numbers from A175859(n). a(n) = 1 if A175856(m) not equal to n for any m, else 0. a(n) = 1 for such n that A175862(n) = 0. a(n) = 0 for such n that A175862(n) >= 1. a(n) + A175860(n) = A000012(n).

Links

• Antti Karttunen, Table of n, a(n) for n = 1..10000
• Index entries for characteristic functions

Crossrefs

Cf. A175856, A175857, A175858, A175859, A175860, A175862.

Programs

PARI

A175861(n) = (1-A175860(n)); \\ Uses program from A175860. - Antti Karttunen, Nov 08 2018

Formula

a(n) = 1 - A175860(n).