A043894 Numbers k such that 2 and 4 occur juxtaposed in the base-5 representation of k but not of k+1.

14, 22, 39, 47, 64, 74, 89, 97, 114, 122, 139, 147, 164, 172, 189, 199, 214, 222, 239, 247, 264, 272, 289, 297, 314, 324, 339, 347, 374, 389, 397, 414, 422, 439, 449, 464, 472, 489, 497, 514, 522, 539, 547, 574, 589, 597, 614

Offset

1,1

Links

Table of n, a(n) for n=1..47.

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 5], {2, 4}]>0 || SequenceCount[IntegerDigits[n, 5], {4, 2}]>0, 1, 0], {n, 700}], {1, 0}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Apr 21 2019 *)

Crossrefs

Cf. A007091.

Sequence in context: A045282 A039291 A043114 * A054276 A305729 A344135

Adjacent sequences: A043891 A043892 A043893 * A043895 A043896 A043897

Keyword

nonn,base

Author

Clark Kimberling

Status

approved