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A266410 a(n) = (A266419(n) - 1) / 2; numbers n such that 2n+1 is a nonludic number (in A192607). 5
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 (list; graph; refs; listen; history; text; internal format)
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 A056991 A242660

Adjacent sequences:  A266407 A266408 A266409 * A266411 A266412 A266413

KEYWORD

nonn

AUTHOR

Antti Karttunen, Jan 28 2016

STATUS

approved

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Last modified December 6 18:03 EST 2019. Contains 329809 sequences. (Running on oeis4.)