A271419 If n is a ludic number, a(n)=0; if n is not a ludic number, a(n) is the ludic number that rejects n from the ludic number sieve.

0, 0, 0, 2, 0, 2, 0, 2, 3, 2, 0, 2, 0, 2, 3, 2, 0, 2, 5, 2, 3, 2, 0, 2, 0, 2, 3, 2, 0, 2, 7, 2, 3, 2, 5, 2, 0, 2, 3, 2, 0, 2, 0, 2, 3, 2, 0, 2, 5, 2, 3, 2, 0, 2, 11, 2, 3, 2, 7, 2, 0, 2, 3, 2, 5, 2, 0, 2, 3, 2, 0, 2, 13, 2, 3, 2, 0, 2, 5, 2, 3, 2, 0, 2, 7

Offset

1,4

Links

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

Formula

a(n) = (1-A192490(n)) * A272565(n). - Antti Karttunen, Sep 11 2016

Prog

(Scheme) (define (A271419 n) (* (- 1 (A192490 n)) (A272565 n))) ;; Antti Karttunen, Sep 11 2016

Crossrefs

Cf. A003309, A192607, A192490, A255127, A260738, A271420, A272565.

Cf. A264940 (analogous version for lucky numbers).

Sequence in context: A294614 A347403 A063918 * A278922 A163169 A097974

Adjacent sequences: A271416 A271417 A271418 * A271420 A271421 A271422

Keyword

nonn

Author

Max Barrentine, Apr 07 2016

Status

approved