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 A309857 #9 Aug 22 2019 17:39:12 %S A309857 2,5,11,29,59,71,107,149,191,197,227,269,431,479,491,857,941,1019, %T A309857 1049,1217,1259,1289,1451,1601,1619,1667,1709,1847,2081,2237,2267, %U A309857 2447,2549,2579,2699,2711,2729,2861,2879,2957,3041,3089,3167,3191,3209,3221,3407,3719,3761,3779 %N A309857 Primes p such that 2*p^3+1 is also prime. %C A309857 All terms == 2 (mod 3). - _Robert Israel_, Aug 22 2019 %H A309857 Robert Israel, <a href="/A309857/b309857.txt">Table of n, a(n) for n = 1..10000</a> %F A309857 A000040 INTERSECT A168550. %p A309857 select(t -> isprime(t) and isprime(2*t^3+1), [2, seq(i,i=5..10000,6)]); # _Robert Israel_, Aug 22 2019 %Y A309857 Cf. A177104 (2*p^3-1 prime), A309856. %K A309857 nonn %O A309857 1,1 %A A309857 _R. J. Mathar_, Aug 20 2019