A249506 Inverse permutation to A249494 (= permutation of the positive integers such that the parity of the first digit of a(n+1) equals that of a(n)'s last digit).

1, 7, 2, 8, 3, 9, 4, 10, 5, 6, 13, 14, 17, 18, 21, 22, 25, 26, 29, 11, 12, 15, 16, 19, 20, 23, 24, 27, 28, 30, 33, 34, 37, 38, 41, 42, 45, 46, 49, 31, 32, 35, 36, 39, 40, 43, 44, 47, 48, 50, 53, 54, 57, 58, 61, 62, 65, 66, 69, 51, 52, 55, 56, 59, 60, 63, 64, 67, 68, 70, 73, 74, 77, 78, 81, 82, 85

Offset: 1

Author

M. F. Hasler, Oct 30 2014

Keywords

• nonn

Comments

See A249278 and A249279 for the variant based on nonnegative integers; A162501 is a variant based not on parity but on equality.

Links

• Index entries for sequences that are permutations of the natural numbers

Crossrefs

Cf. A000030, A162501.

Programs

PARI

a=vector(#A249494);for(i=1,#a,A249494[i]<=#a&&a[A249494[i]]=i);a \\ Result only valid up to the first zero.