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 A092837 #9 Feb 16 2025 08:32:53
%S A092837 2,3,4,19,24,227,255,443,1381,3329,3817,3947
%N A092837 Indices of terms in the series for sec(x) that have prime numerators.
%H A092837 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Secant.html">Secant</a>
%t A092837 f[n_] := Numerator[EulerE[2n]/(2n)! ]; Do[If[PrimeQ[f[n]], Print[n]], {n, 3329}] (* _Ryan Propper_, Apr 01 2007 *)
%Y A092837 Cf. A092838.
%K A092837 nonn,more
%O A092837 1,1
%A A092837 _Eric W. Weisstein_, Mar 07 2004
%E A092837 More terms from _Ryan Propper_, Apr 01 2007, May 11 2007