A081241 Position in B of reversal of n-th term of B, where B is the logic-binary sequence, A007931.

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

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