A029489 Numbers k that divide the (left) concatenation of all numbers <= k written in base 20 (most significant digit on left).

1, 19, 41, 61, 67, 251, 331, 361, 401, 25327, 290719, 3113179, 7271623, 270029129

Offset

1,2

Comments

No other terms below 3*10^10.

Links

Table of n, a(n) for n=1..14.

Index entries for related sequences

Mathematica

b = 20; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[IntegerDigits[#, b], c], b], #] &] (* Robert Price, Mar 12 2020 *)

Crossrefs

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

Sequence in context: A019393 A378121 A179849 * A155024 A323391 A248339

Adjacent sequences: A029486 A029487 A029488 * A029490 A029491 A029492

Keyword

nonn,base,more

Author

Olivier Gérard

Extensions

More terms from Larry Reeves (larryr(AT)acm.org), Oct 15 2001

Edited and updated by Larry Reeves (larryr(AT)acm.org), Apr 12 2002

a(12), a(13) from Max Alekseyev, May 15 2011

a(14) from Jason Yuen, Jun 29 2024

Status

approved