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A043956 Numbers n such that 4 and 7 occur juxtaposed in the base 8 representation of n but not of n+1. 0
39, 60, 103, 124, 167, 188, 231, 252, 295, 319, 359, 380, 423, 444, 487, 508, 551, 572, 615, 636, 679, 700, 743, 764, 807, 831, 871, 892, 935, 956, 999, 1020, 1063, 1084, 1127, 1148, 1191, 1212, 1255, 1276, 1319, 1343, 1383 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

Transpose[SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 8], {4, 7}]>0||SequenceCount[IntegerDigits[n, 8], {7, 4}]>0, 1, 0], {n, 1500}], {1, 0}]][[1]] (* The program uses the SequencePosition and SequenceCount functions from Mathematica version 10 *) (* Harvey P. Dale, Jun 08 2016 *)

CROSSREFS

Sequence in context: A050780 A039353 A043176 * A090876 A165461 A020166

Adjacent sequences:  A043953 A043954 A043955 * A043957 A043958 A043959

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified June 14 05:10 EDT 2021. Contains 345018 sequences. (Running on oeis4.)