id:A111206 - OEIS Search Results

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Semi-Sophie Germain semiprimes: semiprimes which are the product of Sophie Germain primes.

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5

4, 6, 9, 10, 15, 22, 25, 33, 46, 55, 58, 69, 82, 87, 106, 115, 121, 123, 145, 159, 166, 178, 205, 226, 249, 253, 262, 265, 267, 319, 339, 346, 358, 382, 393, 415, 445, 451, 466, 478, 502, 519, 529, 537, 562, 565, 573, 583, 586, 655, 667, 699, 717, 718, 753, 838 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Define an n-almost Sophie Germain almost-prime to be an n-almost prime all the prime factors of which are Sophie Germain primes. Note the contrast between this terminology and that of Sophie Germain n-almost primes, they are different.`
	EXAMPLE	`a(4)=10 because 10 is the 4th semiprime both the prime factors of which are Sophie Germain primes.`
	CROSSREFS	`Cf. A111153, A001358, A005384, A111207.` `Sequence in context: A137167 A122492 A133234 this_sequence A087112 A077554 A118778` `Adjacent sequences: A111203 A111204 A111205 this_sequence A111207 A111208 A111209`
	KEYWORD	`nonn`
	AUTHOR	`Christopher M. Tomaszewski (cmt1288(AT)comcast.net), Oct 24 2005`
	EXTENSIONS	`Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 31 2005`

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Last modified July 23 17:35 EDT 2008. Contains 142285 sequences.

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