A043123 Numbers k such that 1 and 4 occur juxtaposed in the base-6 representation of k but not of k-1.

10, 25, 46, 60, 82, 97, 118, 133, 150, 169, 190, 205, 226, 241, 262, 276, 298, 313, 334, 349, 360, 406, 421, 442, 457, 478, 492, 514, 529, 550, 565, 582, 601, 622, 637, 658, 673, 694, 708, 730, 745, 766, 781, 798, 817, 838, 853

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 6], {1, 4}]>0 || SequenceCount[IntegerDigits[n, 6], {4, 1}]>0, 1, 0], {n, 900}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Oct 12 2016 *)

Crossrefs

Cf. A007092.

Sequence in context: A047721 A155576 A269457 * A043903 A163631 A100536

Adjacent sequences: A043120 A043121 A043122 * A043124 A043125 A043126

Keyword

nonn,base

Author

Clark Kimberling

Status

approved