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 A081241 Position in B of reversal of n-th term of B, where B is the logic-binary sequence, A007931. 2
 1, 2, 3, 5, 4, 6, 7, 11, 9, 13, 8, 12, 10, 14, 15, 23, 19, 27, 17, 25, 21, 29, 16, 24, 20, 28, 18, 26, 22, 30, 31, 47, 39, 55, 35, 51, 43, 59, 33, 49, 41, 57, 37, 53, 45, 61, 32, 48, 40, 56, 36, 52, 44, 60, 34, 50, 42, 58, 38, 54, 46, 62, 63, 95, 79, 111, 71, 103, 87, 119, 67 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS A self-inverse permutation of the natural numbers; a(n) = n if and only if A007931(n) is a palindrome. The natural numbers written backwards digit-wise in bijective base-2 numeration, and interpreted forwards. - Harald Korneliussen, Apr 11 2019 LINKS Carl R. White, Table of n, a(n) for n = 1..16383 Index entries for sequences that are permutations of the natural numbers EXAMPLE A007931 = (1,2,11,12,21,22,111,112,121,122,211,...); and (reversal of term #8) = term #11. CROSSREFS Cf. A007931. Sequence in context: A132196 A153150 A069766 * A180201 A233277 A279339 Adjacent sequences: A081238 A081239 A081240 * A081242 A081243 A081244 KEYWORD base,easy,nonn,look AUTHOR Clark Kimberling, Mar 11 2003 STATUS approved

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Last modified August 6 14:16 EDT 2024. Contains 374974 sequences. (Running on oeis4.)