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 A051131 #19 Feb 16 2025 08:32:41 %S A051131 2,5,877,27644437,35742549198872617291353508656626642567, %T A051131 359334085968622831041960188598043661065388726959079837 %N A051131 Prime Bell numbers (A000110). %H A051131 E. T. Bell, <a href="http://www.jstor.org/stable/2300300">Exponential numbers</a>, Amer. Math. Monthly, 41 (1934), 411-419. %H A051131 The Prime Database, <a href="https://primes.utm.edu/primes/page.php?id=68825">Bell(2841)</a>, the next term which is too large to include here. %H A051131 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/BellNumber.html">Bell Number</a> %e A051131 Bell(2)=2 and Bell(3)=5 are primes, Bell(4)..Bell(6) are composite, Bell(7)=877 is prime. %Y A051131 Cf. A000110, A051130. %K A051131 nonn %O A051131 1,1 %A A051131 _Ignacio Larrosa Cañestro_