A061949 Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 20 (most significant digit on right).

1, 2, 4, 5, 6, 10, 12, 14, 18, 19, 57, 119, 133, 209, 399, 437, 633, 1102, 3517, 5719, 29849, 38532, 42759, 198639, 247801, 421591, 566561, 819185, 6781309

Offset

1,2

Comments

This sequence differs from A029513 in that all least significant zeros are removed before concatenation.

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

Links

Table of n, a(n) for n=1..29.

Index entries for related sequences

Example

See A061931 for example.

Mathematica

b = 20; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[c, IntegerDigits[IntegerReverse[#, b], b]], b], #] &] (* Robert Price, Mar 08 2020 *)

Crossrefs

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

Sequence in context: A029465 A014871 A029513 * A233413 A128167 A364214

Adjacent sequences: A061946 A061947 A061948 * A061950 A061951 A061952

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; Aug 25, 2002

a(28)-a(29) from Lars Blomberg, Oct 25 2011

Status

approved