A043992 Numbers k such that 5 and 8 occur juxtaposed in the base-9 representation of k but not of k+1.

53, 77, 134, 158, 215, 239, 296, 320, 377, 401, 458, 485, 539, 563, 620, 644, 701, 725, 782, 806, 863, 887, 944, 968, 1025, 1049, 1106, 1130, 1187, 1214, 1268, 1292, 1349, 1373, 1430, 1454, 1511, 1535, 1592, 1616, 1673, 1697

Offset

1,1

Links

Table of n, a(n) for n=1..42.

Mathematica

j58Q[n_]:=Module[{idn=IntegerDigits[n, 9]}, If[SequenceCount[idn, {5, 8}]+ SequenceCount[idn, {8, 5}]>0, 1, 0]]; Transpose[SequencePosition[ Array[ j58Q, 1700], {1, 0}]][[1]] (* The program uses the SequenceCount and SequencePosition functions from Mathematica version 10 *) (* Harvey P. Dale, Sep 09 2015 *)

Crossrefs

Cf. A007095.

Sequence in context: A107309 A039389 A043212 * A032421 A129257 A125875

Adjacent sequences: A043989 A043990 A043991 * A043993 A043994 A043995

Keyword

nonn,base

Author

Clark Kimberling

Status

approved