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A139079 Smallest number not yet in the sequence that contains the last digit of the previous term, with a(1) = 1. 0
1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 101, 11, 12, 2, 21, 13, 3, 23, 31, 14, 4, 24, 34, 41, 15, 5, 25, 35, 45, 51, 16, 6, 26, 36, 46, 56, 61, 17, 7, 27, 37, 47, 57, 67, 71, 18, 8, 28, 38, 48, 58, 68, 78, 81, 19, 9, 29, 39, 49, 59, 69, 79, 89, 91, 102, 22, 32, 42, 52, 62, 72 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

This is a permutation of the positive integers.

LINKS

Table of n, a(n) for n=1..72.

MAPLE

a := [1] ; for n from 2 to 100 do ldig := op(-1, a) mod 10 ; for c from 1 do if c in a then ; else dgs := convert(c, base, 10) ; if ldig in dgs then a := [op(a), c] ; break; fi; fi; od: od: print(a) ; # R. J. Mathar

CROSSREFS

Cf. A076654, A125886.

Sequence in context: A282150 A044895 A156819 * A209932 A011540 A098394

Adjacent sequences:  A139076 A139077 A139078 * A139080 A139081 A139082

KEYWORD

base,nonn

AUTHOR

Franklin T. Adams-Watters, Jan 31 2009

STATUS

approved

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Last modified November 23 20:23 EST 2017. Contains 295141 sequences.