A043999 Numbers k such that 0 and 4 occur juxtaposed in the base-10 representation of k but not of k+1.

40, 104, 140, 204, 240, 304, 340, 409, 440, 504, 540, 604, 640, 704, 740, 804, 840, 904, 940, 1004, 1049, 1104, 1140, 1204, 1240, 1304, 1340, 1409, 1440, 1504, 1540, 1604, 1640, 1704, 1740, 1804, 1840, 1904, 1940, 2004, 2049

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {0, 4}]>0 || SequenceCount[ IntegerDigits[n], {4, 0}]>0, 1, 0], {n, 2100}], {1, 0}][[All, 1]] (* Harvey P. Dale, Aug 10 2021 *)

Crossrefs

Sequence in context: A235017 A043219 A039396 * A044227 A044608 A241024

Adjacent sequences: A043996 A043997 A043998 * A044000 A044001 A044002

Keyword

nonn,base

Author

Clark Kimberling

Status

approved