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A061931
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Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 2 (most significant digit on right).
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142
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1, 3, 7, 39, 63, 523, 4983, 25007, 892217, 1142775, 1381311, 1751751
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| This sequence differs from A029495 in that all least significant zeros are removed before concatenation.
No more terms < 10^7. [Lars Blomberg, Oct 17 2011]
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LINKS
| Index entries for related sequences
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EXAMPLE
| 1234567 -> (1)(01)(11)(001)(101)(011)(111) base 2 -> 1111110111111 base 2 = 8127 and 7 divides 8127.
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CROSSREFS
| Cf. A029447-A029470, A029471-A029494, A029495-A029518, A029519-A029542, A061931-A061954, A061955-A061978.
Sequence in context: A173561 A169741 A192198 * A057203 A056250 A113870
Adjacent sequences: A061928 A061929 A061930 * A061932 A061933 A061934
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KEYWORD
| nonn,base
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AUTHOR
| Larry Reeves (larryr(AT)acm.org), May 24 2001
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EXTENSIONS
| Edited and updated by Larry Reeves (larryr(AT)acm.org), Apr 12, 2002
a(9)-a(12) from Lars Blomberg (lars.blomberg(AT)visit.se), Oct 17 2011
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