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 A089241 #19 Sep 08 2022 08:45:12 %S A089241 6,8,12,16,24,28,36,40,48,60,64,76,84,88,96,108,120,124,136,144,148, %T A089241 160,168,180,196,204,208,216,220,228,256,264,276,280,300,304,316,328, %U A089241 336,348,360,364,384,388,396,400,424,448,456,460,468,480,484 %N A089241 Even numbers k such that k/2 - 1 is prime. %D A089241 M. Cerasoli, F. Eugeni and M. Protasi, Elementi di Matematica Discreta, Bologna 1988 %D A089241 Emanuele Munarini and Norma Zagaglia Salvi, Matematica Discreta,UTET, CittaStudiEdizioni, Milano 1997 %H A089241 Vincenzo Librandi, <a href="/A089241/b089241.txt">Table of n, a(n) for n = 1..5000</a> %F A089241 a(n) = 2*prime(n) + 2. - _Alonso del Arte_, Mar 02 2017 %t A089241 2Prime[Range[100]] + 2 (* _Alonso del Arte_, Mar 06 2017 *) %o A089241 (PARI) a(n)=2*prime(n) + 2 \\ _Charles R Greathouse IV_, Mar 06 2017 %o A089241 (Magma) [2*NthPrime(n)+2: n in [1..60]]; // _Vincenzo Librandi_, Jan 09 2018 %Y A089241 a(n) = A072055(n) + 1. %Y A089241 a(n) = A029933(A000040(n)). %K A089241 easy,nonn %O A089241 1,1 %A A089241 _Giovanni Teofilatto_, Dec 22 2003 %E A089241 Corrected (62 replaced by 64, 202 replaced by 204, 314 by 316, 386 by 388) by _R. J. Mathar_, Apr 22 2010 %E A089241 Offset corrected by _Arkadiusz Wesolowski_, Aug 09 2011