id:A063127 - OEIS Search Results

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Composite numbers which in base 2 contain their largest proper factor as a substring.

+0
3

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; listen)

	OFFSET	`1,1`
	MATHEMATICA	`Do[ If[ !PrimeQ[ n ] && StringPosition[ ToString[ FromDigits[ IntegerDigits[ n, 2 ] ] ], ToString[ FromDigits[ IntegerDigits[ Divisors[ n ] [ [ -2 ] ], 2 ] ] ] ] != {}, Print[ n ] ], {n, 2, 150} ]`
	CROSSREFS	`Cf. A062238.` `Sequence in context: A039767 A054023 A032583 this_sequence A103517 A093161 A111305` `Adjacent sequences: A063124 A063125 A063126 this_sequence A063128 A063129 A063130`
	KEYWORD	`base,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 08 2001`

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Last modified August 28 19:25 EDT 2008. Contains 143183 sequences.

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