A043946 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, 167, 212, 226, 279, 290, 340, 354, 404, 418, 468, 482, 532, 546, 596, 610, 660, 679, 724, 738, 791, 802, 852, 866, 916, 930, 980, 994, 1044, 1058, 1108, 1122, 1172, 1191, 1236, 1250, 1343, 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}], {1, 0}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jul 25 2020 *)

Crossrefs

Cf. A007094.

Sequence in context: A293694 A039343 A043166 * A160937 A060124 A068476

Adjacent sequences: A043943 A043944 A043945 * A043947 A043948 A043949

Keyword

nonn,base

Author

Clark Kimberling

Status

approved