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A029519 Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 2 (most significant digit on right). 142
1, 3, 7, 17, 27, 63, 92883, 1556671 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

This sequence differs from A061955 in that all least significant zeros are removed before concatenation.

No more terms < 10^7. [Lars Blomberg, Aug 31 2011]

LINKS

Table of n, a(n) for n=1..8.

Index entries for related sequences

EXAMPLE

7654321 -> (111)(011)(101)(001)(11)(01)(1) base 2 -> 1111110111111 base 2 = 8127 and 7 divides 8127

CROSSREFS

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

Sequence in context: A041663 A042825 A076033 * A045424 A106968 A191081

Adjacent sequences:  A029516 A029517 A029518 * A029520 A029521 A029522

KEYWORD

nonn,base,more

AUTHOR

Olivier Gérard

EXTENSIONS

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

Additional comments and example from Larry Reeves (larryr(AT)acm.org), May 25 2001

Terms verified by Rick L. Shepherd, Feb 24 2009

1 more term from Sean A. Irvine, Oct 04 2009

STATUS

approved

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Last modified October 1 18:25 EDT 2014. Contains 247522 sequences.