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 A241808 #32 Sep 08 2022 08:46:07 %S A241808 1,2,4,5,7,8,13,17,19,20,37,40,53,55,58,62,68,79,89,92,95,103,112,115, %T A241808 119,128,137,140,158,160,169,170,193,205,214,223,229,232,235,242,248, %U A241808 265,272,275,278,295,313,317,322,323,337,355,359,364 %N A241808 Numbers k such that (2*k)^3 - 3 is prime. %H A241808 Amiram Eldar, <a href="/A241808/b241808.txt">Table of n, a(n) for n = 1..10000</a> %F A241808 a(n) = A153974(n)/2. - _R. J. Mathar_, May 14 2014 %t A241808 Select[Range[400], PrimeQ[(2*#)^3 - 3] &] (* _Amiram Eldar_, Aug 29 2020 *) %o A241808 (Magma) [n: n in [1..500] | IsPrime((2*n)^3 - 3)]; // _Juri-Stepan Gerasimov_, May 12 2014 %o A241808 (PARI) is(n)=isprime((2*n)^3-3) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A241808 Cf. A006254, A153974. %K A241808 nonn,easy %O A241808 1,2 %A A241808 _Gerasimov Sergey_, Apr 29 2014