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Search: id:A063137
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A063137 Composite numbers not divisible by 2, 3 or 5 which contain their largest proper factor as a substring in base 2. +0
1
91, 343, 407, 493, 539, 637, 893, 1001, 1189, 1309, 1343, 1403, 1643, 1681, 1771, 1859, 1961, 2527, 2717, 2783, 3059, 3151, 3179, 3223, 3451, 3703, 3731, 3773, 3887, 4063, 4199, 4459, 4579, 4669, 4823, 4913, 4991, 5291, 5453, 5491, 5719 (list; graph; listen)
OFFSET

1,1

EXAMPLE

a(7)= 19 * 47= 893: '1101111101' contains '101111' (47) and 5 < 19.

CROSSREFS

Cf. A062238.

Sequence in context: A051973 A000864 A020441 this_sequence A020218 A084319 A047696

Adjacent sequences: A063134 A063135 A063136 this_sequence A063138 A063139 A063140

KEYWORD

base,nonn

AUTHOR

Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 08 2001

EXTENSIONS

Edited by frank.ellermann(AT)t-online.de, Feb 08 2002

page 1

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.


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