id:A073434 - OEIS Search Results

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Primes p such that 2p+1 is prime and there are an even number of primes in the interval [p+1,2p+1].

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2, 3, 5, 11, 23, 41, 53, 83, 131, 233, 239, 251, 359, 443, 491, 509, 641, 719, 743, 761, 809, 953, 1019, 1031, 1103, 1451, 1511, 1559, 1583, 1733, 1889, 1901, 1931, 1973, 2063, 2069, 2129, 2273, 2351, 2543, 2549, 2693, 2753, 2819, 2903, 2939, 2963, 2969 (list; graph; listen)

	OFFSET	`1,1`
	MATHEMATICA	`Select[Prime/@Range[500], PrimeQ[2#+1]&&EvenQ[PrimePi[2#+1]-PrimePi[ # ]]&]`
	CROSSREFS	`Sequence in context: A038905 A019405 A079848 this_sequence A162278 A027763 A060696` `Adjacent sequences: A073431 A073432 A073433 this_sequence A073435 A073436 A073437`
	KEYWORD	`nonn`
	AUTHOR	`Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Oct 03 2002`
	EXTENSIONS	`Edited by Dean Hickerson (dean.hickerson(AT)yahoo.com), Oct 09 2002`

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Last modified December 5 08:23 EST 2009. Contains 170348 sequences.

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