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A043225 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, 120, 210, 221, 312, 321, 412, 421, 512, 521, 612, 621, 712, 721, 812, 821, 912, 921, 1012, 1021, 1112, 1120, 1200, 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: A218043 A048344 A039402 * A111066 A201015 A044005

Adjacent sequences:  A043222 A043223 A043224 * A043226 A043227 A043228

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified April 5 20:24 EDT 2020. Contains 333260 sequences. (Running on oeis4.)