A344449 Lexicographically earliest sequence S of distinct positive terms such that the n-th odd digit of S is present in a(n).

1, 3, 5, 7, 9, 10, 11, 12, 13, 14, 23, 15, 30, 16, 25, 31, 17, 35, 32, 18, 19, 27, 33, 45, 34, 21, 41, 29, 37, 36, 38, 50, 39, 51, 61, 49, 43, 47, 53, 63, 52, 73, 59, 54, 71, 81, 69, 83, 57, 55, 93, 103, 56, 67, 113, 58, 79, 65, 70, 91, 100, 89, 123, 75, 72, 85, 95, 90, 130, 101, 131, 105, 74, 102, 104, 132, 115

Offset

1,2

Links

Table of n, a(n) for n=1..77.

Example

The 11th odd digit of S is 3 (from 13) and this 3 is present in the 11th term of S (which is 23).

Mathematica

a[1]=1; a[n_]:=a[n]=Block[{k=1}, While[MemberQ[l=Array[a, n-1], k]||FreeQ[IntegerDigits@k, Quiet@Select[Flatten[IntegerDigits/@Join[l, {k}]], OddQ][[n]]], k++]; k]; Array[a, 77] (* Giorgos Kalogeropoulos, May 11 2022 *)

Crossrefs

Cf. A247143.

Sequence in context: A047747 A007957 A194377 * A258432 A344000 A128938

Adjacent sequences: A344446 A344447 A344448 * A344450 A344451 A344452

Keyword

base,nonn

Author

Eric Angelini and Carole Dubois, May 19 2021

Status

approved