This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A057738 #29 May 17 2025 23:36:58 %S A057738 2,3,139 %N A057738 Primes p such that 3^p + 2 is prime. %C A057738 Primes in A051783. - _Jens Kruse Andersen_, Jun 29 2014 %C A057738 No further terms < 1753089 using A051783. - _Michael S. Branicky_, May 14 2025 %D A057738 J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 139, p. 48, Ellipses, Paris 2008. %e A057738 a(2) = 3 because 3^3 + 2 = 29 is prime. %t A057738 For[n = 1, n < 700, n++, If[PrimeQ[3^Prime[n] + 2], Print[Prime[n]]]] (* _Stefan Steinerberger_, Mar 18 2006 *) %o A057738 (Magma) [p: p in PrimesUpTo(2000) | IsPrime(3^p+2)]; // _Vincenzo Librandi_, Jun 30 2014 %Y A057738 Cf. A051783, A057739. %K A057738 more,nonn,bref %O A057738 1,1 %A A057738 _G. L. Honaker, Jr._, Oct 29 2000