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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
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
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
KEYWORD
base,nonn
AUTHOR
Eric Angelini and Carole Dubois, Mar 23 2020
STATUS
approved