A043127 Numbers k such that 2 and 5 occur juxtaposed in the base-6 representation of k but not of k-1.

17, 32, 53, 68, 89, 102, 125, 140, 161, 176, 192, 212, 233, 248, 269, 284, 305, 318, 341, 356, 377, 392, 408, 428, 449, 464, 485, 500, 521, 534, 557, 572, 593, 608, 612, 665, 680, 701, 716, 737, 750, 773, 788, 809, 824, 840, 860

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 6], {2, 5}|{5, 2}]>0, 1, 0], {n, 1000}], {0, 1}][[;; , 2]] (* Harvey P. Dale, Aug 04 2023 *)

Crossrefs

Cf. A007092.

Sequence in context: A335360 A058899 A038354 * A043907 A173054 A162624

Adjacent sequences: A043124 A043125 A043126 * A043128 A043129 A043130

Keyword

nonn,base

Author

Clark Kimberling

Status

approved