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 A051507 Primes p such that p*q+2 is prime, where q is next prime after p. 10
 3, 5, 7, 13, 19, 67, 149, 179, 229, 239, 241, 269, 277, 307, 313, 397, 401, 419, 439, 487, 569, 613, 643, 701, 823, 863, 887, 1051, 1289, 1319, 1489, 1609, 1693, 1783, 1873, 1999, 2143, 2239, 2309, 2423, 2539, 2549, 2593, 2617, 2729, 2753, 2819 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Charles R Greathouse IV, Table of n, a(n) for n = 1..10000 MATHEMATICA Prime[Select[Range[1000], PrimeQ[Prime[#]*Prime[# + 1] + 2] &]] Reap[Do[If[PrimeQ[(p=Prime[k])*Prime[k+1]+2], Sow[p]], {k, 1, 430}]][[2, 1]] (* Zak Seidov, Dec 05 2010 *) PROG (Sage) A051507 = list(p for p in primes(10**4) if is_prime(p*next_prime(p)+2)) # D. S. McNeil, Dec 04 2010 (PARI) p=2; forprime(q=3, 1e4, if(isprime(p*q+2), print1(p", ")); p=q) \\ Charles R Greathouse IV, May 01 2011 CROSSREFS Cf. A048880. Sequence in context: A154700 A187872 A180450 * A173145 A347834 A060274 Adjacent sequences: A051504 A051505 A051506 * A051508 A051509 A051510 KEYWORD nonn,easy AUTHOR N. J. A. Sloane STATUS approved

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Last modified May 29 11:04 EDT 2024. Contains 372938 sequences. (Running on oeis4.)