A043936 Numbers k such that 0 and 5 occur juxtaposed in the base-8 representation of k but not of k+1.

40, 69, 104, 133, 168, 197, 232, 261, 296, 327, 360, 389, 424, 453, 488, 517, 559, 581, 616, 645, 680, 709, 744, 773, 808, 839, 872, 901, 936, 965, 1000, 1029, 1071, 1093, 1128, 1157, 1192, 1221, 1256, 1285, 1320, 1351, 1384

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Mathematica

n05Q[n_]:=MemberQ[Sort/@Partition[IntegerDigits[n, 8], 2, 1], {0, 5}]; Select[ Range[1500], n05Q[#]&&!n05Q[#+1]&] (* Harvey P. Dale, May 07 2011 *)
SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 8], {0, 5}]>0||SequenceCount[IntegerDigits[n, 8], {5, 0}]>0, 1, 0], {n, 1500}], {1, 0}][[;; , 1]] (* Harvey P. Dale, May 14 2026 *)

Crossrefs

Cf. A007094.

Sequence in context: A134216 A043156 A039333 * A251123 A064635 A098517

Adjacent sequences: A043933 A043934 A043935 * A043937 A043938 A043939

Keyword

nonn,base

Author

Clark Kimberling

Status

approved