id:A078834 - OEIS Search Results

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Greatest prime factor of n also contained as binary substring in binary representation of n; a(n)=1, if no such factor exists.

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1, 2, 3, 2, 5, 3, 7, 2, 1, 5, 11, 3, 13, 7, 3, 2, 17, 2, 19, 5, 1, 11, 23, 3, 1, 13, 3, 7, 29, 3, 31, 2, 1, 17, 1, 2, 37, 19, 3, 5, 41, 2, 43, 11, 5, 23, 47, 3, 1, 2, 3, 13, 53, 3, 11, 7, 3, 29, 59, 3, 61, 31, 7, 2, 1, 2, 67, 17, 1, 2, 71, 2, 73, 37, 5, 19, 1, 3, 79, 5, 1, 41, 83, 2, 5, 43 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n) <= min{A078833(n), A006530(n)};` `for n>1: a(n) = n iff n is prime.`
	EXAMPLE	`n=15=3*5 has two factors; only '11'=3 is contained in '1111'=15, therefore a(15)=3.`
	CROSSREFS	`Cf. A078833, A078822, A007088, A006530.` `Sequence in context: A086281 A097975 A130088 this_sequence A039634 A078833 A109674` `Adjacent sequences: A078831 A078832 A078833 this_sequence A078835 A078836 A078837`
	KEYWORD	`nonn,base,nice`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 08 2002`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

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