A061971 Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 18 (most significant digit on right).

1, 17, 89, 6343, 9707, 9799, 91069, 120581, 484307, 725341, 2571749, 3432583, 4482203

Offset

1,2

Comments

This sequence differs from A029535 in that all least significant zeros are kept during concatenation.

No more terms < 8*10^6.

Links

Table of n, a(n) for n=1..13.

Index entries for related sequences

Example

See A061955 for example.

Mathematica

b = 18; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[Reverse[IntegerDigits[#, b]], c], b], #] &] (* Robert Price, Mar 09 2020 *)

Crossrefs

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

Sequence in context: A200670 A057638 A159676 * A061222 A371492 A228462

Adjacent sequences: A061968 A061969 A061970 * A061972 A061973 A061974

Keyword

nonn,base,more

Author

Larry Reeves (larryr(AT)acm.org), May 24 2001 a(9)-a(13) from

Extensions

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

a(9)-a(13) from Lars Blomberg, Aug 02 2011

Status

approved