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A044005 Numbers n such that 1 and 2 occur juxtaposed in the base 10 representation of n but not of n+1. 0
12, 21, 112, 129, 219, 221, 312, 321, 412, 421, 512, 521, 612, 621, 712, 721, 812, 821, 912, 921, 1012, 1021, 1112, 1129, 1299, 1312, 1321, 1412, 1421, 1512, 1521, 1612, 1621, 1712, 1721, 1812, 1821, 1912, 1921, 2012, 2021 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..41.

CROSSREFS

Sequence in context: A043225 A111066 A201015 * A321771 A225864 A134514

Adjacent sequences:  A044002 A044003 A044004 * A044006 A044007 A044008

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified December 13 12:49 EST 2018. Contains 318086 sequences. (Running on oeis4.)