A043244 Numbers k such that 3 and 8 occur juxtaposed in the base-10 representation of k but not of k-1.

38, 83, 138, 183, 238, 283, 338, 380, 438, 483, 538, 583, 638, 683, 738, 783, 830, 883, 938, 983, 1038, 1083, 1138, 1183, 1238, 1283, 1338, 1380, 1438, 1483, 1538, 1583, 1638, 1683, 1738, 1783, 1830, 1883, 1938, 1983, 2038

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {3, 8}]>0 || SequenceCount[IntegerDigits[n], {8, 3}]>0, 1, 0], {n, 2500}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jun 21 2017 *)

Crossrefs

Sequence in context: A219999 A219997 A039421 * A044024 A133529 A211498

Adjacent sequences: A043241 A043242 A043243 * A043245 A043246 A043247

Keyword

nonn,base

Author

Clark Kimberling

Status

approved