id:A072965 - OEIS Search Results

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In prime factorization of n replace all matching twin prime pairs by 1, where (3,5)-matches are replaced before (5,7).

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1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 1, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 2, 31, 32, 33, 34, 1, 36, 37, 38, 39, 40, 41, 42, 43, 44, 3, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 4, 61, 62, 63, 64, 65, 66, 67, 68, 69, 2, 71, 72, 73, 74 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(a(n)) = a(n); a(A037074(n)) = 1.` `a(n) = 1 iff n = A074480(k) for some k.` `a(n) mod A037074(k) > 0 for all k. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jan 29 2008`
	LINKS	`R. Zumkeller, Table of n, a(n) for n = 1..10000`
	EXAMPLE	`a(30)=a(235)=21=2; a(105)=a(357)=17=7; a(143)=a(1113)=1; a(225)=a(3355)=a(35)(35))=11=1; a(525)=a(3557)=a((35)(57))=1*1=1.`
	CROSSREFS	`Cf. A001359, A006512, A000040.` `Sequence in context: A080331 A167463 A053835 this_sequence A043274 A124196 A139179` `Adjacent sequences: A072962 A072963 A072964 this_sequence A072966 A072967 A072968`
	KEYWORD	`nonn,nice`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 20 2002`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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