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

Author

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

Keywords

• nonn
• base
• more

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]

Examples

			See A061931 for example.
		

Links

• Index entries for related sequences

Crossrefs

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

Programs

Mathematica

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

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