id:A111207 - OEIS Search Results

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Numbers that are both Sophie Germain semiprimes and semi-Sophie Germain semiprimes.

+0
2

4, 10, 25, 46, 55, 106, 123, 145, 159, 205, 226, 267, 339, 358, 415, 466, 529, 573, 583, 718, 753, 843, 865, 979, 1077, 1195, 1243, 1257, 1293, 1366, 1405, 1465, 1473, 1486, 2098, 2157, 2206, 2427, 2455, 2545, 2563, 2581, 2599, 2629, 2809, 2818, 2998, 3057 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`This is the intersection of the sequence of Sophie Germain semiprimes (A111153) and semi-Sophie Germain semiprimes (A111206).`
	EXAMPLE	`a(4)=46 because 46 is the 4th semiprime such that 246+1=93 is a semiprime and both of its factors are Sophie.` `Germain primes: 22+1=5 and 2*23+1=47.`
	CROSSREFS	`Cf. A111153, A001358, A005384, A111206.` `Sequence in context: A107961 A051864 A111153 this_sequence A113412 A033539 A020748` `Adjacent sequences: A111204 A111205 A111206 this_sequence A111208 A111209 A111210`
	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 25 07:41 EDT 2008. Contains 142293 sequences.

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