A044172 - OEIS

A044172

Numbers n such that string 4,6 occurs in the base 7 representation of n but not of n-1.

34, 83, 132, 181, 230, 238, 279, 328, 377, 426, 475, 524, 573, 581, 622, 671, 720, 769, 818, 867, 916, 924, 965, 1014, 1063, 1112, 1161, 1210, 1259, 1267, 1308, 1357, 1406, 1455, 1504, 1553, 1602, 1610, 1651, 1666, 1749, 1798

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OFFSET

1,1

LINKS

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

MATHEMATICA

Transpose[SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 7], {4, 6}]>0, 1, 0], {n, 2000}], {0, 1}]][[2]] (* The program uses the SequencePosition and SequenceCount functions from Mathematica version 10 *) (* Harvey P. Dale, May 14 2016 *)

CROSSREFS

Sequence in context: A118619 A258413 A066944 * A044553 A066284 A036199

Adjacent sequences: A044169 A044170 A044171 * A044173 A044174 A044175

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved