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 A059863 #25 Apr 03 2023 10:36:10
%S A059863 1,1,1,3,21,189,2457,36855,700245,17506125,472665375,15597957375,
%T A059863 577124422875,22507852492125,967837657161375,47424045200907375,
%U A059863 2608322486049905625,148674381704844620625,9366486047405211099375,627554565176149143658125,43301264997154290912410625
%N A059863 a(n) = Product_{i=3..n} (prime(i)-4).
%D A059863 See A059862 for references.
%D A059863 Steven R. Finch, Mathematical Constants, Cambridge, 2003, pp. 84-94.
%H A059863 C. K. Caldwell, <a href="https://t5k.org/glossary/page.php?sort=PrimeKtupleConjecture">Prime k-tuple Conjecture</a>
%H A059863 Steven R. Finch, <a href="http://www.people.fas.harvard.edu/~sfinch/constant/hrdyltl/hrdyltl.html">Hardy-Littlewood Constants </a> [Broken link]
%H A059863 Steven R. Finch, <a href="http://web.archive.org/web/20010614100031/http://www.mathsoft.com/asolve/constant/hrdyltl/hrdyltl.html">Hardy-Littlewood Constants </a> [From the Wayback machine]
%H A059863 G. Niklasch, <a href="/A001692/a001692.html">Some number theoretical constants: 1000-digit values</a> [Cached copy]
%o A059863 (PARI) a(n) = prod(i=3, n, prime(i)-4); \\ _Michel Marcus_, Aug 25 2019
%Y A059863 Cf. A049296, A002110, A005867, A000847, A022008, A051160-A051168, A048298, A059861-A059865.
%K A059863 nonn
%O A059863 1,4
%A A059863 _Labos Elemer_, Feb 28 2001
%E A059863 More terms from _Michel Marcus_, Aug 25 2019