id:A066388 - OEIS Search Results

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Numbers n such that n and 2n are both between a pair of twin primes.

+0
5

6, 30, 660, 810, 2130, 2550, 3330, 3390, 5850, 6270, 10530, 33180, 41610, 44130, 53550, 55440, 57330, 63840, 65100, 70380, 70980, 72270, 74100, 74760, 78780, 80670, 81930, 87540, 93240, 102300, 115470, 124770, 133980, 136950, 156420 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Also terms of A014574 such that twice the term is also in A014574. Related to a problem of anti-divisors.` `A117499(a(n)) = 4. - Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Mar 23 2006`
	LINKS	`Eric Weisstein's World of Mathematics, Bitwin Chain`
	EXAMPLE	`For n=30, 29 and 31 are prime, as are 59 and 61.`
	CROSSREFS	`Cf. A001359, A006512, A012574.` `Sequence in context: A119634 A075591 A130075 this_sequence A088256 A136349 A119411` `Adjacent sequences: A066385 A066386 A066387 this_sequence A066389 A066390 A066391`
	KEYWORD	`nonn`
	AUTHOR	`Jud McCranie (j.mccranie(AT)comcast.net), Dec 23 2001`

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

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