A257803 Positions of odd numbers in A233271, the infinite trunk of inverted binary beanstalk.

1, 4, 7, 9, 12, 17, 18, 21, 23, 24, 25, 27, 30, 34, 35, 38, 41, 42, 49, 52, 53, 54, 55, 57, 60, 64, 65, 68, 70, 73, 74, 75, 76, 77, 81, 82, 83, 90, 93, 95, 96, 103, 106, 107, 108, 109, 111, 114, 118, 119, 122, 127, 128, 131, 132, 134, 136, 137, 138, 139, 140, 145, 147, 148, 149, 150, 151, 155, 156, 157, 164, 167, 168, 171

Offset

1,2

Links

Antti Karttunen, Table of n, a(n) for n = 1..7973

Formula

Other identities:

For all n >= 1, A257807(a(n)) = n. [A257807 works as a left inverse for this injective function.]

Prog

(Scheme, with Antti Karttunen's IntSeq-library)
(define A257803 (MATCHING-POS 1 1 (lambda (n) (odd? (A233271 n)))))
(define A257803 (MATCHING-POS 1 1 (lambda (n) (odd? (A257800 n)))))

Crossrefs

Complement: A257804.

Cf. A233271, A257800, A257806, A257807.

Sequence in context: A310954 A301692 A310955 * A310956 A310957 A173757

Adjacent sequences: A257800 A257801 A257802 * A257804 A257805 A257806

Keyword

nonn

Author

Antti Karttunen, May 12 2015

Status

approved