id:A059961 - OEIS Search Results

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Numbers of form n=(2^a)*(3^b) (A033845) such that both n-1 and n+1 are primes. Special twin prime averages (A001454).

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6, 12, 18, 72, 108, 192, 432, 1152, 2592, 139968, 472392, 786432, 995328, 57395628, 63700992, 169869312, 4076863488, 10871635968, 2348273369088, 56358560858112, 79164837199872, 84537841287168, 150289495621632 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`Subset of A027856. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 05 2008]`
	EXAMPLE	`a(13)=243*4096=995328 and {995327,995329} are twin primes of special form. The next term > p(1000000).`
	CROSSREFS	`Cf. A001454, A002822, A033845, A058383.` `Sequence in context: A162864 A134107 A067143 this_sequence A100357 A135358 A081846` `Adjacent sequences: A059958 A059959 A059960 this_sequence A059962 A059963 A059964`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Mar 02 2001`
	EXTENSIONS	`More terms from William Rex Marshall (w.r.marshall(AT)actrix.co.nz), Mar 18 2001`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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