A043166 Numbers k such that 2 and 4 occur juxtaposed in the base-8 representation of k but not of k-1.

20, 34, 84, 98, 148, 160, 212, 226, 272, 290, 340, 354, 404, 418, 468, 482, 532, 546, 596, 610, 660, 672, 724, 738, 784, 802, 852, 866, 916, 930, 980, 994, 1044, 1058, 1108, 1122, 1172, 1184, 1236, 1250, 1280, 1364, 1378, 1428

Offset

1,1

Links

Table of n, a(n) for n=1..44.

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 8], {2, 4}]>0 || SequenceCount[ IntegerDigits[n, 8], {4, 2}]>0, 1, 0], {n, 1500}], {0, 1}][[All, 2]] (* Harvey P. Dale, Sep 07 2021 *)

Crossrefs

Cf. A007094.

Sequence in context: A108669 A293694 A039343 * A043946 A160937 A060124

Adjacent sequences: A043163 A043164 A043165 * A043167 A043168 A043169

Keyword

nonn,base

Author

Clark Kimberling

Status

approved