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 A257803 Positions of odd numbers in A233271, the infinite trunk of inverted binary beanstalk. 10
 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 (list; graph; refs; listen; history; text; internal format)
 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

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Last modified December 11 18:19 EST 2019. Contains 329925 sequences. (Running on oeis4.)