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 A057738 Primes p such that 3^p + 2 is prime. 2
 2, 3, 139 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS No other terms below 2*10^5. Primes in A051783. - Jens Kruse Andersen, Jun 29 2014 REFERENCES J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 139, p. 48, Ellipses, Paris 2008. LINKS EXAMPLE a(2) = 3 because 3^3 + 2 = 29 is prime. MATHEMATICA For[n = 1, n < 700, n++, If[PrimeQ[3^Prime[n] + 2], Print[Prime[n]]]] (* Stefan Steinerberger, Mar 18 2006 *) PROG (MAGMA) [p: p in PrimesUpTo(2000) | IsPrime(3^p+2)]; // Vincenzo Librandi, Jun 30 2014 CROSSREFS Cf. A051783, A057739. Sequence in context: A010343 A118169 A066908 * A234999 A254787 A042073 Adjacent sequences:  A057735 A057736 A057737 * A057739 A057740 A057741 KEYWORD more,nonn,bref AUTHOR G. L. Honaker, Jr., Oct 29 2000 EXTENSIONS Lower bound for the next term updated by Max Alekseyev, Jun 14 2011 STATUS approved

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Last modified May 12 02:06 EDT 2021. Contains 343808 sequences. (Running on oeis4.)