id:A031442 - OEIS Search Results

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a(0) = 13; for n > 0, a(n) is the greatest prime factor of PreviousPrime(a(n-1))*a(n-1)-1 where PreviousPrime(prime(k))=prime(k-1).

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13, 71, 41, 379, 23561, 5431, 20269, 89, 1231, 44497, 329952671, 36583, 1126159, 90209117, 14095897, 15272393, 13887359, 256460794943, 2740505805180429880723, 1591234463080874838018721796071210709 (list; graph; listen)

	OFFSET	`0,1`
	CROSSREFS	`Cf. A031441.` `Sequence in context: A085461 A081860 A050403 this_sequence A066831 A067382 A128003` `Adjacent sequences: A031439 A031440 A031441 this_sequence A031443 A031444 A031445`
	KEYWORD	`nonn`
	AUTHOR	`Yasutoshi Kohmoto (zbi74583(AT)boat.zero.ad.jp)`
	EXTENSIONS	`More terms from Kok Seng Chua (chuaks(AT)ihpc.nus.edu.sg), May 23 2000. a(19) and a(20) are strong pseudoprimes to many bases.`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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