A061961 Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 8 (most significant digit on right).

1, 7, 21, 123, 147, 341, 457, 2387, 3919, 19859, 42623, 495509, 5380575, 5382069, 6798589

Offset

1,2

Comments

This sequence differs from A029525 in that all least significant zeros are kept during concatenation.

No more terms < 10^7. [Lars Blomberg, Aug 22 2011]

Links

Table of n, a(n) for n=1..15.

Index entries for related sequences

Example

See A061955 for example.

Mathematica

b = 8; 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: A001185 A001693 A321521 * A028248 A267609 A032032

Adjacent sequences: A061958 A061959 A061960 * A061962 A061963 A061964

Keyword

nonn,base,more

Author

Larry Reeves (larryr(AT)acm.org), May 24 2001

Extensions

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

a(12)-a(15) from Lars Blomberg, Aug 22 2011

Status

approved