A344450 Lexicographically earliest sequence S of distinct nonnegative terms such that the n-th even digit of S is present in a(n).

0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 30, 40, 24, 50, 21, 34, 60, 22, 41, 26, 70, 23, 25, 42, 27, 36, 80, 28, 29, 43, 32, 52, 46, 38, 90, 62, 48, 72, 44, 82, 92, 45, 56, 58, 100, 61, 102, 47, 68, 112, 49, 54, 78, 120, 121, 64, 63, 81, 101, 103, 65, 104, 122, 74, 66, 83, 123, 84, 94, 85, 124, 105, 125, 67

Offset

1,2

Links

Table of n, a(n) for n=1..75.

Example

The 14th even digit of S is 4 (from 40) and this 4 is present in the 14th term of S (which is 24).

Mathematica

a[1]=0; 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}]], EvenQ][[n]]], k++]; k]; Array[a, 75] (* Giorgos Kalogeropoulos, May 11 2022 *)

Crossrefs

Cf. A247143.

Sequence in context: A134930 A084562 A344453 * A240714 A276463 A187350

Adjacent sequences: A344447 A344448 A344449 * A344451 A344452 A344453

Keyword

base,nonn

Author

Eric Angelini and Carole Dubois, May 19 2021

Status

approved