login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

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
OFFSET
1,1
COMMENTS
Odd nonludic numbers (A266419) decremented by one, then halved.
LINKS
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. permutations A266418, A266638.
Cf. also A047845.
Sequence in context: A175149 A153053 A045752 * A010380 A358348 A056991
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jan 28 2016
STATUS
approved