A043989 Numbers k such that 4 and 8 occur juxtaposed in the base-9 representation of k but not of k+1.

44, 76, 125, 157, 206, 238, 287, 319, 368, 404, 449, 481, 530, 562, 611, 643, 692, 724, 773, 805, 854, 886, 935, 967, 1016, 1048, 1097, 1133, 1178, 1210, 1259, 1291, 1340, 1372, 1421, 1453, 1502, 1534, 1583, 1615, 1664, 1696

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 9], {4, 8}]>0||SequenceCount[IntegerDigits[n, 9], {8, 4}]>0, 1, 0], {n, 1700}], {1, 0}] [[;; , 1]] (* Harvey P. Dale, Nov 03 2024 *)

Crossrefs

Cf. A007095.

Sequence in context: A074172 A039386 A043209 * A050272 A260201 A112721

Adjacent sequences: A043986 A043987 A043988 * A043990 A043991 A043992

Keyword

nonn,base

Author

Clark Kimberling

Status

approved