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 A092840 #18 Feb 16 2025 08:32:53
%S A092840 3,11,197,103049
%N A092840 Primes in A001003.
%C A092840 The next term is too large to include.
%H A092840 Harry J. Smith, <a href="/A092840/b092840.txt">Table of n, a(n) for n = 1..5</a>
%H A092840 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SuperCatalanNumber.html">Super Catalan Number</a>
%o A092840 (PARI) s(m)= { if (m==1, return(a1)); if (m==2, return(a2)); r = (3*(2*m - 3)*a2 - (m - 3)*a1)/m; a1=a2; a2=r; return(r); }
%o A092840 { a1=1; a2=1; n=0; for (m=1, 300, a=s(m); if (isprime(a), n++; print1(a, ", "))); } \\ _Harry J. Smith_, Jun 21 2009
%Y A092840 Cf. A001003, A092839.
%K A092840 nonn
%O A092840 1,1
%A A092840 _Eric W. Weisstein_, Mar 07 2004