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A090331 Largest proper divisor of n that is also a prefix of n in binary. 4
1, 1, 2, 1, 3, 1, 4, 1, 5, 1, 6, 1, 7, 3, 8, 1, 9, 1, 10, 1, 11, 1, 12, 1, 13, 3, 14, 1, 15, 1, 16, 1, 17, 1, 18, 1, 19, 1, 20, 1, 21, 1, 22, 5, 23, 1, 24, 1, 25, 3, 26, 1, 27, 1, 28, 3, 29, 1, 30, 1, 31, 7, 32, 1, 33, 1, 34, 1, 35, 1, 36, 1, 37, 1, 38, 1, 39, 1, 40, 1, 41, 1, 42, 5, 43 (list; graph; refs; listen; history; text; internal format)
OFFSET
2,3
COMMENTS
a(n) = 1 iff A090330(n) = 0;
a(A090332(n))=1; a(A090334(n))>1.
LINKS
Eric Weisstein's World of Mathematics, Proper Divisor
CROSSREFS
Sequence in context: A342703 A249068 A308073 * A338759 A229994 A165818
KEYWORD
nonn,base
AUTHOR
Reinhard Zumkeller, Nov 26 2003, corrected May 08 2004
EXTENSIONS
Edited by N. J. A. Sloane, Aug 19 2008 at the suggestion of Leroy Quet
STATUS
approved

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Last modified March 29 04:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)