A333324 Lexicographically earliest sequence of positive distinct integers such that if a(n) steps over a(n) commas to the right, it is met by a term whose leftmost digit is odd.

1, 3, 2, 4, 5, 6, 7, 9, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 30, 20, 31, 21, 32, 22, 33, 23, 34, 24, 35, 25, 36, 26, 37, 27, 38, 28, 39, 29, 40, 50, 41, 42, 51, 43, 44, 52, 45, 46, 53, 47, 48, 54, 49, 55, 56, 57, 58, 59, 60, 61, 70, 62, 63, 71, 64, 65, 72, 66, 67, 73, 68, 69, 74, 75, 76, 77, 78, 79, 90, 80

Offset

1,2

Links

Table of n, a(n) for n=1..81.

Example

a(1) = 1 steps over 1 comma to be met by the odd digit 3;
a(2) = 3 steps over 3 commas to be met by the odd digit 5;
a(3) = 2 steps over 2 commas to be met by the same odd digit 5;
a(4) = 4 steps over 4 commas to be met by the odd digit 9;
a(5) = 5 steps over 5 commas to be met by the odd digit 1 (of 10);
a(6) = 6 steps over 6 commas to be met by the odd digit 1 (of 12); etc.

Crossrefs

Cf. A333404 (same idea but the leftmost digit is prime) and A333406 (the leftmost digit is nonprime).

Sequence in context: A035044 A359663 A171086 * A333470 A096135 A092829

Adjacent sequences: A333321 A333322 A333323 * A333325 A333326 A333327

Keyword

base,nonn

Author

Eric Angelini and Carole Dubois, Mar 23 2020

Status

approved