A043957 Numbers k such that 5 and 6 occur juxtaposed in the base-8 representation of k but not of k+1.

46, 53, 110, 117, 174, 181, 238, 245, 302, 309, 366, 375, 431, 437, 494, 501, 558, 565, 622, 629, 686, 693, 750, 757, 814, 821, 878, 887, 943, 949, 1006, 1013, 1070, 1077, 1134, 1141, 1198, 1205, 1262, 1269, 1326, 1333, 1390

Offset

1,1

Links

Table of n, a(n) for n=1..43.

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 8], {5, 6}]>0 || SequenceCount[IntegerDigits[n, 8], {6, 5}]>0, 1, 0], {n, 1500}], {1, 0}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, May 07 2019 *)

Crossrefs

Cf. A007094.

Sequence in context: A269671 A039354 A043177 * A363762 A336098 A115444

Adjacent sequences: A043954 A043955 A043956 * A043958 A043959 A043960

Keyword

nonn,base

Author

Clark Kimberling

Status

approved