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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
KEYWORD
nonn,easy
AUTHOR
STATUS
approved

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