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 A182785 #15 Sep 08 2022 08:45:55 %S A182785 2,5,7,47,79,103,131,139,149,173,197,229,307,313,331,373,439,541,547, %T A182785 593,659,743,761,797,853,859,863,883,919,937,1051,1093,1097,1163,1171, %U A182785 1301,1303,1451,1471,1549,1601,1657,1721,1861,1973,2039,2081,2087,2099,2129,2161,2239,2269,2393,2417,2437,2473,2521 %N A182785 Primes p such that 2*p^4-1 is also prime. %H A182785 Vincenzo Librandi, <a href="/A182785/b182785.txt">Table of n, a(n) for n = 1..1000</a> %F A182785 A000040 INTERSECT A182783. %t A182785 Select[Prime[Range[500]], PrimeQ[2 #^4 - 1]&] (* _Vincenzo Librandi_, Apr 17 2013 *) %o A182785 (Magma) [p: p in PrimesUpTo(2600)| IsPrime(2*p^4 - 1)]; // _Vincenzo Librandi_, Apr 17 2013 %Y A182785 Cf. A182783, A182784, A106483 (2p^2-1 prime), A177104 (2p^3-1 prime), A309855 (2p^5-1 prime). %K A182785 nonn,easy %O A182785 1,1 %A A182785 _Vincenzo Librandi_, Dec 02 2010