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 A051438 #33 Jun 30 2024 02:47:14 %S A051438 2,5,17,47,127,307,709,1613,3659,8147,17851,38867,84011,180497,386083, %T A051438 821603,1742527,3681113,7754017,16290041,34136021,71378551,148948133, %U A051438 310248233,645155191,1339484149,2777105117,5750079043,11891268397,24563311217,50685770143 %N A051438 a(n) = prime(2^n - 1). %H A051438 Amiram Eldar, <a href="/A051438/b051438.txt">Table of n, a(n) for n = 1..78</a> (calculated using the b-file at A033844; terms 1..57 from Hugo Pfoertner) %F A051438 a(n) = A181363(2^n - 1). - _Reinhard Zumkeller_, Oct 16 2010 %F A051438 a(n) = A000040(A000225(n)). - _Michel Marcus_, Nov 28 2017 %F A051438 a(n) = A151799(A033844(n)). - _Amiram Eldar_, Jun 30 2024 %t A051438 Prime[2^Range[34] - 1] (* _Vladimir Joseph Stephan Orlovsky_, Jul 19 2011 *) %o A051438 (PARI) a(n)=prime(2^n-1) \\ _Charles R Greathouse IV_, Sep 28 2015 %Y A051438 Cf. A000040, A000225, A033844, A018249, A051440, A051439, A151799. %K A051438 nonn %O A051438 1,1 %A A051438 _N. J. A. Sloane_ %E A051438 More terms from Michael Lugo (mlugo(AT)thelabelguy.com), Dec 22 1999