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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
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 (list; graph; refs; listen; history; text; internal format)
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

Cf. A043096 (numbers in which every pair of adjacent digits are distinct).

Sequence in context: A035284 A265403 A215940 * A320170 A082927 A108965

Adjacent sequences:  A337863 A337864 A337865 * A337867 A337868 A337869

KEYWORD

nonn,base

AUTHOR

Eric Angelini and Carole Dubois, Sep 27 2020

STATUS

approved

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Last modified January 22 01:28 EST 2022. Contains 350481 sequences. (Running on oeis4.)