id:A115093 - OEIS Search Results

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Primes of the form p*q-2, where p and q are distinct primes.

+0
3

13, 19, 31, 37, 53, 67, 83, 89, 109, 113, 127, 131, 139, 157, 181, 199, 211, 233, 251, 257, 263, 293, 307, 317, 337, 353, 379, 389, 401, 409, 443, 449, 467, 479, 487, 491, 499, 503, 509, 541, 557, 563, 571, 577, 587, 631, 647, 653, 677, 683, 701, 719, 743 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`This sequence is a subset of A063637, which is the union of this sequence and A049002.`
	MATHEMATICA	`SemiPrimeQ[n_] := (n>1) && (2==Plus@@(Transpose[FactorInteger[n]][[2]])); Select[Prime[Range[150]], SemiPrimeQ[ #+2] && !IntegerQ[Sqrt[ #+2]]&]`
	CROSSREFS	`Cf. A049002 (primes of the form p^2-2, where p is prime), A063637 (primes of the form p*q-2 where p and q are primes).` `Sequence in context: A108097 A102764 A092738 this_sequence A040092 A079130 A085413` `Adjacent sequences: A115090 A115091 A115092 this_sequence A115094 A115095 A115096`
	KEYWORD	`nonn`
	AUTHOR	`T. D. Noe (noe(AT)sspectra.com), Mar 01 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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