A044709 Numbers n such that string 8,5 occurs in the base 9 representation of n but not of n+1.

77, 158, 239, 320, 401, 482, 563, 644, 701, 725, 806, 887, 968, 1049, 1130, 1211, 1292, 1373, 1430, 1454, 1535, 1616, 1697, 1778, 1859, 1940, 2021, 2102, 2159, 2183, 2264, 2345, 2426, 2507, 2588, 2669, 2750, 2831, 2888, 2912, 2993, 3074, 3155, 3236, 3317

Offset

1,1

Links

Georg Fischer, Table of n, a(n) for n = 1..1000

Maple

q:= n-> searchtext("58", cat("", convert(n, base, 9)[]))>0:
a:= proc(n) option remember; local k; for k from 1+
     `if`(n=1, 0, a(n-1)) while not q(k) or q(k+1) do od; k
    end:
seq(a(n), n=1..50);  # Alois P. Heinz, Jun 27 2019

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 9], {8, 5}]>0, 1, 0], {n, 3500}], {1, 0}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, May 19 2021 *)

Crossrefs

Cf. A007095, A044328.

Sequence in context: A118226 A113945 A044328 * A338189 A308963 A075253

Adjacent sequences: A044706 A044707 A044708 * A044710 A044711 A044712

Keyword

nonn,base

Author

Clark Kimberling

Extensions

Corrected and extended by Harvey P. Dale, Dec 24 2015

Previous values restored by Georg Fischer, Jun 27 2019

Status

approved