A043938 Numbers k such that 0 and 7 occur juxtaposed in the base-8 representation of k but not of k+1.

56, 71, 120, 135, 184, 199, 248, 263, 312, 327, 376, 391, 440, 455, 504, 519, 575, 583, 632, 647, 696, 711, 760, 775, 824, 839, 888, 903, 952, 967, 1016, 1031, 1087, 1095, 1144, 1159, 1208, 1223, 1272, 1287, 1336, 1351, 1400

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 8], {0, 7}]> 0 || SequenceCount[IntegerDigits[n, 8], {7, 0}]>0, 1, 0], {n, 1500}], {1, 0}][[All, 1]] (* Harvey P. Dale, Oct 31 2021 *)

Crossrefs

Cf. A007094.

Sequence in context: A050440 A043158 A039335 * A328165 A214250 A286981

Adjacent sequences: A043935 A043936 A043937 * A043939 A043940 A043941

Keyword

nonn,base

Author

Clark Kimberling

Status

approved