A044158 Numbers n such that string 2,6 occurs in the base 7 representation of n but not of n-1.

20, 69, 118, 140, 167, 216, 265, 314, 363, 412, 461, 483, 510, 559, 608, 657, 706, 755, 804, 826, 853, 902, 951, 980, 1049, 1098, 1147, 1169, 1196, 1245, 1294, 1343, 1392, 1441, 1490, 1512, 1539, 1588, 1637, 1686, 1735, 1784

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 7], {2, 6}]>0, 1, 0], {n, 2000}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, May 31 2019 *)

Crossrefs

Sequence in context: A303620 A221521 A145191 * A044539 A297597 A186735

Adjacent sequences: A044155 A044156 A044157 * A044159 A044160 A044161

Keyword

nonn,base

Author

Clark Kimberling

Status

approved