A029520 Numbers k such that k divides the (left) concatenation of all numbers <= k written in base 3 (most significant digit on right).

1, 4, 5, 7, 19, 443, 19952, 81544, 919648, 1186844

Offset

1,2

Comments

This sequence differs from A061956 in that all least significant zeros are removed before concatenation.

No more terms < 10^7. [Lars Blomberg, Sep 02 2011]

Links

Table of n, a(n) for n=1..10.

Index entries for related sequences

Example

See A029519 for example.

Mathematica

b = 3; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[IntegerDigits[IntegerReverse[#, b], b], c], b], #] &] (* Robert Price, Mar 13 2020 *)

Prog

(J) ab=. #.^:_1
mkcat=. [ ab&.> [ #.&.> [ |.@:ab&.> [: |. [: >: [: i. ]
seq=. ] +. [ #. [: ; mkcat
3 (] #~ ] = seq"0) >: i.500x NB. Stephen Makdisi, May 03 2018

Crossrefs

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

Sequence in context: A056659 A292321 A049896 * A123368 A292164 A178439

Adjacent sequences: A029517 A029518 A029519 * A029521 A029522 A029523

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(9)-a(10) from Lars Blomberg, Sep 02 2011

Status

approved