A266410 a(n) = (A266419(n) - 1) / 2; numbers n such that 2n+1 is a nonludic number (in A192607).

4, 7, 9, 10, 13, 15, 16, 17, 19, 22, 24, 25, 27, 28, 29, 31, 32, 34, 36, 37, 39, 40, 42, 43, 46, 47, 49, 50, 51, 52, 54, 55, 56, 58, 61, 62, 64, 66, 67, 68, 69, 70, 72, 73, 75, 76, 77, 79, 81, 82, 83, 84, 85, 88, 91, 92, 93, 94, 95, 97, 98, 99, 100, 101, 102, 103, 106, 107, 108, 109, 112, 114, 115, 118, 120, 121

Offset

1,1

Comments

Odd nonludic numbers (A266419) decremented by one, then halved.

Links

Antti Karttunen, Table of n, a(n) for n = 1..10220

Formula

a(n) = (A266419(n) - 1) / 2.

Prog

(Scheme, with Antti Karttunen's IntSeq-library)
(define (A266410 n) (/ (- (A266419 n) 1) 2))
(define A266410 (ZERO-POS 1 1 (lambda (n) (A192490 (+ n n 1)))))

Crossrefs

Complement: A266409.

Cf. A192490, A192607, A266419.

Cf. permutations A266418, A266638.

Cf. also A047845.

Sequence in context: A175149 A153053 A045752 * A010380 A358348 A056991

Adjacent sequences: A266407 A266408 A266409 * A266411 A266412 A266413

Keyword

nonn

Author

Antti Karttunen, Jan 28 2016

Status

approved