A260723 First differences of Ludic numbers: a(n) = A003309(n+1) - A003309(n).

1, 1, 2, 2, 4, 2, 4, 6, 2, 4, 8, 4, 2, 4, 6, 8, 6, 4, 6, 6, 6, 2, 6, 10, 8, 4, 2, 6, 4, 12, 6, 8, 4, 12, 2, 4, 2, 12, 16, 2, 10, 2, 4, 6, 2, 4, 8, 10, 8, 12, 6, 4, 14, 6, 6, 16, 2, 6, 4, 12, 6, 2, 16, 6, 6, 8, 10, 8, 4, 2, 10, 2, 4, 8, 18, 4, 8, 6, 12, 4, 6, 6, 8, 10, 8, 6, 12, 12, 12, 4, 12, 2, 12, 6, 4, 8, 18, 4, 6, 6, 8, 6, 12, 6, 6, 6, 4, 20, 6

Offset: 1

Author

Antti Karttunen, Aug 06 2015

Keywords

• nonn

Links

• Antti Karttunen, Table of n, a(n) for n = 1..10000
• Index entries for sequences generated by sieves

Crossrefs

Cf. A003309.

Cf. also A001223, A031883, A260722.

Programs

Scheme

(define (A260723 n) (- (A003309 (+ n 1)) (A003309 n)))

Formula

a(n) = A003309(n+1) - A003309(n).