A271420 - OEIS

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A271420

Nonludicity of n.

0, 0, 0, 1, 0, 1, 0, 1, 2, 1, 0, 1, 0, 1, 2, 1, 0, 1, 3, 1, 2, 1, 0, 1, 0, 1, 2, 1, 0, 1, 4, 1, 2, 1, 3, 1, 0, 1, 2, 1, 0, 1, 0, 1, 2, 1, 0, 1, 3, 1, 2, 1, 0, 1, 5, 1, 2, 1, 4, 1, 0, 1, 2, 1, 3, 1, 0, 1, 2, 1, 0, 1, 6, 1, 2, 1, 0, 1, 3, 1, 2, 1, 0, 1, 4, 1

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OFFSET

1,9

COMMENTS

If n is ludic, a(n)=0; if n is nonludic, a(n) is the step at which n is rejected from the ludic number sieve.

LINKS

Max Barrentine, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = (1-A192490(n)) * A260738(n). - Antti Karttunen, Sep 11 2016

PROG

(Scheme) (define (A271419 n) (* (- 1 (A192490 n)) (A260738 n))) -- Antti Karttunen, Sep 11 2016

CROSSREFS