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A063127
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Composite numbers which in base 2 contain their largest proper factor as a substring.
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2
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4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 55, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 91, 92, 94, 96, 98, 100, 102, 104, 106, 108, 110, 112, 114, 116, 118, 120, 122, 124, 126, 128
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..65.
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MATHEMATICA
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Do[ If[ !PrimeQ[ n ] && StringPosition[ ToString[ FromDigits[ IntegerDigits[ n, 2 ] ] ], ToString[ FromDigits[ IntegerDigits[ Divisors[ n ] [ [ -2 ] ], 2 ] ] ] ] != {}, Print[ n ] ], {n, 2, 150} ]
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CROSSREFS
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Cf. A062238.
Sequence in context: A054023 A032583 A175074 * A103517 A163300 A193175
Adjacent sequences: A063124 A063125 A063126 * A063128 A063129 A063130
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KEYWORD
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base,nonn
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AUTHOR
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Robert G. Wilson v, Aug 08 2001
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STATUS
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approved
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