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

Author

Clark Kimberling, Mar 11 2003

Keywords

• base
• easy
• nonn
• look

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

Examples

			A007931 = (1,2,11,12,21,22,111,112,121,122,211,...); and (reversal of term #8) = term #11.
		

Links

• Carl R. White, Table of n, a(n) for n = 1..16383
• Index entries for sequences that are permutations of the natural numbers

Crossrefs

Cf. A007931.