id:A079797 - OEIS Search Results

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Products of two primes p and q such that (p*q)^2 + p^2 - q^2 and (p*q)^2 - p^2 + q^2 are both prime.

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6, 14, 22, 33, 35, 38, 62, 69, 74, 85, 115, 119, 146, 159, 214, 219, 237, 267, 301, 335, 339, 469, 511, 519, 537, 542, 559, 566, 573, 591, 597, 634, 718, 721, 737, 794, 803, 851, 878, 917, 933, 1003, 1007, 1042, 1059, 1099, 1219, 1226, 1241, 1271, 1294, 1299 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`The two primes generated from p and q are sometimes called flip-flap twin primes. There is probably an infinity of them.`
	EXAMPLE	`a(2) = 14 since (27)^2 + 2^2 - 7^2 = 151 and (27)^2 - 2^2 + 7^2 = 241 are both primes.`
	CROSSREFS	`Sequence in context: A079299 A043445 A017137 this_sequence A093380 A123228 A015832` `Adjacent sequences: A079794 A079795 A079796 this_sequence A079798 A079799 A079800`
	KEYWORD	`easy,nonn`
	AUTHOR	`Olivier Gerard (olivier.gerard(AT)gmail.com), Feb 19 2003`

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

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