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 A131426 #24 Sep 08 2022 08:45:31 %S A131426 1,3,7,11,19,23,31,35,43,55,59,71,79,83,91,103,115,119,131,139,143, %T A131426 155,163,175,191,199,203,211,215,223,251,259,271,275,295,299,311,323, %U A131426 331,343,355,359,379,383,391,395,419,443,451,455,463,475,479,499,511,523,535,539,551,559,563,583,611 %N A131426 a(n) = 2*prime(n) - 3. %C A131426 Right border of triangle A131424. %F A131426 a(n) = 2*A000040(n) - 3. %e A131426 a(4) = 11 = 2*p(4) - 3 = 2*7 - 3. %p A131426 A131426:=n->2*ithprime(n)-3: seq(A131426(n), n=1..70); # _Wesley Ivan Hurt_, Mar 30 2015 %t A131426 2#-3&/@Prime[Range[80]] (* _Harvey P. Dale_, Jul 24 2011 *) %o A131426 (Magma) [2*NthPrime(n) - 3: n in [1..65]]; // _Vincenzo Librandi_, Mar 30 2015 %o A131426 (PARI) a(n) = 2*prime(n) - 3 \\ _Charles R Greathouse IV_, Jul 12 2016 %Y A131426 Cf. A000040, A062709, A131424. %K A131426 nonn,easy %O A131426 1,2 %A A131426 _Gary W. Adamson_, Jul 10 2007