A029537 Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 20 (most significant digit on right).

1, 19, 27, 67, 269, 399, 5627, 76439, 269549, 277951, 424441

Offset

1,2

Comments

This sequence differs from A061973 in that all least significant zeros are removed before concatenation.

No more terms < 10^7. [Lars Blomberg, Sep 25 2011]

Links

Table of n, a(n) for n=1..11.

Index entries for related sequences

Example

See A029519 for example.

Mathematica

b = 20; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[IntegerDigits[IntegerReverse[#, b], b], c], b], #] &] (* Robert Price, Mar 13 2020 *)

Crossrefs

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

Sequence in context: A006626 A259054 A029510 * A053592 A146683 A146651

Adjacent sequences: A029534 A029535 A029536 * A029538 A029539 A029540

Keyword

nonn,base,more

Author

Olivier Gérard

Extensions

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

Additional comments and more terms from Larry Reeves (larryr(AT)acm.org), Jun 04 2001

a(11) from Lars Blomberg, Sep 25 2011

Status

approved