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 A045536 Primes p such that p+2 and 2p+1 are also prime. 16
 3, 5, 11, 29, 41, 179, 191, 239, 281, 419, 431, 641, 659, 809, 1019, 1031, 1049, 1229, 1289, 1451, 1481, 1931, 2129, 2141, 2339, 2549, 2969, 3299, 3329, 3359, 3389, 3539, 3821, 3851, 4019, 4271, 4481, 5231, 5279, 5441, 5501, 5639, 5741, 5849, 6131 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Intersection of A001359 and A005384. - Zak Seidov, Feb 28 2017 LINKS T. D. Noe, Table of n, a(n) for n = 1..1000 MAPLE select(t -> isprime(t) and isprime(t+2) and isprime(2*t+1), [3, seq(t, t=5..10000, 6)]); # Robert Israel, Feb 28 2017 MATHEMATICA Select[Prime[Range[1000]], PrimeQ[#+2] && PrimeQ[2#+1]&] (* Vladimir Joseph Stephan Orlovsky, Mar 30 2011*) PROG (MAGMA) [p: p in PrimesUpTo(6200) | IsPrime(p+2) and IsPrime(2*p+1)]; // Vincenzo Librandi, Apr 08 2013 (PARI) is(n)=isprime(n) && isprime(n+2) && isprime(2*n+1) \\ Charles R Greathouse IV, Feb 25 2014 CROSSREFS Cf. A001359, A005384. Sequence in context: A191025 A093706 A109945 * A319393 A019338 A292539 Adjacent sequences:  A045533 A045534 A045535 * A045537 A045538 A045539 KEYWORD nonn,easy AUTHOR EXTENSIONS Corrected by Jud McCranie, Dec 30 2000 Name changed and incorrect comment and program removed by T. D. Noe, Aug 05 2010 STATUS approved

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Last modified August 8 05:50 EDT 2020. Contains 336290 sequences. (Running on oeis4.)