A337866 - OEIS

A337866

Lexicographically earliest sequence of distinct positive integers such that a(n) + a(n+1) has at least one pair of identical adjacent digits.

1, 10, 12, 21, 23, 32, 34, 43, 45, 54, 46, 9, 2, 20, 13, 31, 24, 42, 35, 53, 47, 8, 3, 19, 14, 30, 25, 41, 36, 52, 48, 7, 4, 18, 15, 29, 26, 40, 37, 51, 49, 6, 5, 17, 16, 28, 27, 39, 38, 50, 60, 55, 11, 22, 33, 44, 56, 57, 58, 59, 63, 70, 74, 81, 85, 92, 96, 103, 97, 69, 64

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OFFSET

1,2

LINKS

Carole Dubois, Table of n, a(n) for n = 1..5001

EXAMPLE

a(1) + a(2) = 1 + 10 = 11 (a pair of 1's);

a(2) + a(3) = 10 + 12 = 22 (a pair of 2's);

a(3) + a(4) = 12 + 21 = 33 (a pair of 3's);

...

a(10) + a(11) = 54 + 46 = 100 (a pair of 0's); etc.

CROSSREFS