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 A327277 #40 Oct 30 2021 17:21:03
%S A327277 2,3,2,3,5,2,3,5,7,11,2,3,5,7,11,13,17,2,3,5,7,11,13,17,19,23,29,31,2,
%T A327277 3,5,7,11,13,17,19,23,29,31,37,41,2,3,5,7,11,13,17,19,23,29,31,37,41,
%U A327277 43,47,53,59,2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67
%N A327277 Irregular triangle read by rows in which row n lists the first prime(n) primes.
%H A327277 Harvey P. Dale, <a href="/A327277/b327277.txt">Table of n, a(n) for n = 1..1000</a>
%e A327277 Table begins:
%e A327277 2, 3;
%e A327277 2, 3, 5;
%e A327277 2, 3, 5, 7, 11;
%e A327277 2, 3, 5, 7, 11, 13, 17;
%e A327277 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31;
%e A327277 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41;
%e A327277 ...
%t A327277 m = 8; p = Array[Prime, Prime[m]]; Join @@ (p[[1 ;; p[[#]]]] & /@ Range[m]) (* _Amiram Eldar_, Sep 24 2019 *)
%t A327277 Table[Take[Prime[Range[Prime[n]]],n],{n,Prime[Range[10]]}]//Flatten (* _Harvey P. Dale_, Oct 30 2021 *)
%Y A327277 Right border gives A006450.
%Y A327277 A138117 is essentially the same triangle.
%K A327277 nonn,tabf
%O A327277 1,1
%A A327277 _Frederick John Bernet III_, Sep 15 2019