A029525 Numbers k such that k divides the (left) concatenation of all numbers <= k written in base 8 (most significant digit on right).

1, 7, 51, 63, 119, 3717, 91153, 147037, 208747, 2707075, 3097013

Offset

1,2

Comments

This sequence differs from A061961 in that all least significant zeros are removed before concatenation.

No more terms < 10^7. - Lars Blomberg, Sep 07 2011

Links

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

Index entries for related sequences

Example

See A029519 for example.

Mathematica

b = 8; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[IntegerDigits[IntegerReverse[#, b], b], c], b], #] &] (* Robert Price, Mar 13 2020 *)

Prog

(PARI) lista(nn, m=8) = my(c, s, t); for(k=1, nn, t+=m^c*s=fromdigits(Vecrev(digits(k, m)), m); c+=logint(s, m)+1; if(t%k==0, print1(k, ", "))); \\ Jinyuan Wang, Dec 05 2020

Crossrefs

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

Sequence in context: A015495 A056581 A039308 * A037500 A037677 A034354

Adjacent sequences: A029522 A029523 A029524 * A029526 A029527 A029528

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(10)-a(11) from Lars Blomberg, Sep 07 2011

Status

approved