A044160 Numbers n such that string 3,1 occurs in the base 7 representation of n but not of n-1.

22, 71, 120, 154, 169, 218, 267, 316, 365, 414, 463, 497, 512, 561, 610, 659, 708, 757, 806, 840, 855, 904, 953, 1002, 1051, 1078, 1149, 1183, 1198, 1247, 1296, 1345, 1394, 1443, 1492, 1526, 1541, 1590, 1639, 1688, 1737, 1786

Offset

1,1

Links

Table of n, a(n) for n=1..42.

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 7], {3, 1}]>0, 1, 0], {n, 2000}], {0, 1}][[;; , 2]] (* Harvey P. Dale, Feb 19 2024 *)

Crossrefs

Sequence in context: A041950 A114636 A334034 * A044541 A251286 A080861

Adjacent sequences: A044157 A044158 A044159 * A044161 A044162 A044163

Keyword

nonn,base

Author

Clark Kimberling

Status

approved