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 A175463 Numbers k such that 8*k + 5 is semiprime. 1
 2, 8, 9, 10, 11, 16, 17, 25, 26, 27, 29, 31, 37, 38, 42, 45, 47, 51, 54, 55, 56, 58, 60, 61, 62, 64, 66, 70, 71, 72, 73, 74, 78, 83, 85, 89, 93, 97, 98, 101, 108, 111, 112, 114, 116, 118, 120, 121, 123, 129, 134, 137, 141, 142, 143, 144, 145, 148, 150, 156, 157, 160 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS FORMULA a(n) = (A175461(n) - 5)/8. MATHEMATICA Select[Range[200], PrimeOmega[8#+5]==2&] (* Harvey P. Dale, Aug 07 2011 *) PROG (MAGMA) IsSemiprime:=func< n | &+[ k[2]: k in Factorization(n) ] eq 2 >; [ n: n in [2..200] | IsSemiprime(8*n+5) ]; // Vincenzo Librandi, Dec 13 2010 CROSSREFS Cf. A175461 Semiprimes of form 8*n+5. Sequence in context: A247635 A152754 A001560 * A167450 A050569 A318175 Adjacent sequences:  A175460 A175461 A175462 * A175464 A175465 A175466 KEYWORD nonn AUTHOR Zak Seidov, May 24 2010 STATUS approved

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Last modified April 6 13:53 EDT 2020. Contains 333276 sequences. (Running on oeis4.)