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 A254955 #24 Sep 08 2022 08:46:11
%S A254955 3,13,37,71,113,181,263,359,463,601,743,911,1091,1291,1511,1747,2017,
%T A254955 2297,2617,2903,3271,3617,4003,4409,4831,5297,5743,6247,6761,7297,
%U A254955 7853,8443,9029,9631,10271,10973,11717,12413,13109,13879,14717,15461,16301,17191,18059
%N A254955 Prime numbers indexed by oblong numbers.
%F A254955 a(n) = prime(n + n^2) = A000040(A002378(n)).
%e A254955 a(1) = prime(1 + 1^2) = prime(2) = 3.
%e A254955 a(2) = prime(2 + 2^2) = prime(6) = 13.
%t A254955 Table[Prime[n + n^2], {n, 100}] (* Puszkarz *)
%t A254955 Prime[2Accumulate[Range[40]]] (* _Alonso del Arte_, Feb 11 2015 *)
%o A254955 (PARI) vector(80, n, prime(n+n^2)) \\ _Michel Marcus_, Feb 12 2015
%o A254955 (Magma) [NthPrime(n+n^2): n in [1..50]]; // _Vincenzo Librandi_, Feb 24 2015
%Y A254955 Cf. A000040, A002378 (n*(n+1)), A011756 (prime(n(n+1)/2)), A011757 (prime(n^2)).
%K A254955 nonn
%O A254955 1,1
%A A254955 _Waldemar Puszkarz_, Feb 11 2015