A043217 Numbers k such that 0 and 2 occur juxtaposed in the base-10 representation of k but not of k-1.

20, 102, 120, 200, 220, 302, 320, 402, 420, 502, 520, 602, 620, 702, 720, 802, 820, 902, 920, 1002, 1020, 1102, 1120, 1200, 1220, 1302, 1320, 1402, 1420, 1502, 1520, 1602, 1620, 1702, 1720, 1802, 1820, 1902, 1920, 2000, 2102

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {0, 2}]>0 || SequenceCount[ IntegerDigits[ n], {2, 0}]>0, 1, 0], {n, 2200}], {0, 1}][[;; , 2]] (* Harvey P. Dale, Dec 29 2023 *)

Crossrefs

Sequence in context: A044271 A044652 A041774 * A039394 A043997 A297585

Adjacent sequences: A043214 A043215 A043216 * A043218 A043219 A043220

Keyword

nonn,base

Author

Clark Kimberling

Status

approved