id:A152843 - OEIS Search Results

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Numbers n such that both 2n+3 and 4n+7 are prime.

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0, 1, 4, 10, 13, 19, 25, 40, 43, 55, 64, 85, 88, 94, 115, 118, 124, 139, 145, 178, 208, 214, 220, 244, 253, 295, 319, 325, 328, 340, 358, 370, 379, 403, 454, 475, 505, 508, 514, 523, 550, 610, 613, 643, 703, 718, 724, 739, 748, 754, 778, 790, 799, 865, 904, 943 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`Or, numbers n such that 2n+3 is a Sophie Germain prime.`
	EXAMPLE	`For n = 10, 2n+3 = 23 is prime and 4n+7 = 47 is prime. 23 = A005384(5).`
	PROGRAM	`(MAGMA) [ n: n in [0..1000] \| IsPrime(2n+3) and IsPrime(4n+7) ];`
	CROSSREFS	`Cf. A067076 (2n+3 is prime), A089986 (4n+7 is prime), A005384 (Sophie Germain primes).` `Sequence in context: A103568 A087444 A143804 this_sequence A139121 A079932 A076270` `Adjacent sequences: A152840 A152841 A152842 this_sequence A152844 A152845 A152846`
	KEYWORD	`nonn`
	AUTHOR	`Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Dec 14 20`
	EXTENSIONS	`Edited and extended by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Dec 22 2008`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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