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 A082132 #13 Oct 23 2023 07:19:26 %S A082132 5,13,47,673,1093,4789,15887,6961,7079,1853387,5636791,16319158451, %T A082132 46975091221,97536826417,9513432505744326182381, %U A082132 2335222008886384800739,7440517660385876970522347503153,83914607657246408236765553419,1960358081272210906656999086971746456168551 %N A082132 a(0) = 5; for n > 0, a(n) is the greatest prime factor of PP(a(n-1))*a(n-1)-2 where PP(n) is an abbreviation for PreviousPrime(n). %C A082132 Some of the larger entries may only correspond to probable primes. %H A082132 Tyler Busby, <a href="/A082132/b082132.txt">Table of n, a(n) for n = 0..22</a> %o A082132 (PARI) p=5;for(k=1,20,print1(p,",");p=precprime(p-1)*p-2;f=factor(p);s=matsize(f)[1];p=f[s,1]) \\ _Rick L. Shepherd_, Dec 19 2004 %Y A082132 Cf. A082021, A031441, A031442. %K A082132 nonn %O A082132 0,1 %A A082132 _Yasutoshi Kohmoto_, May 10 2003 %E A082132 Edited by _Rick L. Shepherd_, Dec 19 2004 %E A082132 a(18) from _Tyler Busby_, Oct 22 2023