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

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

Cf. A003309, A192490, A192607, A255127, A271419.

Cf. A265859 (analogous version for lucky numbers).

Sequence in context: A334208 A159195 A265859 * A099313 A316491 A097468

Adjacent sequences: A271417 A271418 A271419 * A271421 A271422 A271423

Keyword

nonn

Author

Max Barrentine, Apr 07 2016

Status

approved