A029465 Numbers k that divide the (right) concatenation of all numbers <= k written in base 20 (most significant digit on left).

1, 2, 4, 5, 6, 10, 12, 14, 18, 19, 20, 24, 25, 30, 36, 38, 40, 45, 48, 50, 57, 58, 60, 71, 72, 74, 75, 76, 80, 85, 90, 95, 100, 114, 120, 144, 150, 152, 171, 180, 190, 200, 225, 228, 240, 261, 285, 300, 304, 318, 342, 360, 361, 380, 400, 410, 475, 500, 608, 703

Offset: 1

Author

Olivier Gérard

Keywords

• nonn
• base

Links

• Robert Price, Table of n, a(n) for n = 1..187

Crossrefs

Cf. A029447-A029470, A029471-A029494, A029495-A029518, A029519-A029542, A061931-A061954, A061955-A061978.

Programs

Mathematica

b = 20; c = {}; Select[Range[10^5], Divisible[FromDigits[
c = Join[c, IntegerDigits[#, b]], b], #] &] (* Robert Price, Mar 11 2020 *)