A043172 Numbers k such that 3 and 6 occur juxtaposed in the base-8 representation of k but not of k-1.

30, 51, 94, 115, 158, 179, 222, 240, 286, 307, 350, 371, 408, 435, 478, 499, 542, 563, 606, 627, 670, 691, 734, 752, 798, 819, 862, 883, 920, 947, 990, 1011, 1054, 1075, 1118, 1139, 1182, 1203, 1246, 1264, 1310, 1331, 1374

Offset

1,1

Links

Table of n, a(n) for n=1..43.

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 8], {3, 6}]>0||SequenceCount[IntegerDigits[n, 8], {6, 3}]>0, 1, 0], {n, 1500}], {0, 1}][[;; , 2]] (* Harvey P. Dale, May 18 2025 *)

Crossrefs

Cf. A007094.

Sequence in context: A361668 A351540 A039349 * A043952 A304047 A174071

Adjacent sequences: A043169 A043170 A043171 * A043173 A043174 A043175

Keyword

nonn,base

Author

Clark Kimberling

Status

approved