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 A262375 #24 Sep 08 2022 08:46:14
%S A262375 3,3,7,23,5,479,2879,19,17,569,14515199,159667199,73,47,61,4993,43,
%T A262375 455999,409,1562713,1249,59,50207,29,71,61651424911,1407512357,41,
%U A262375 43613,10839629,209206253,47699,3915930850588639,12149,337,97,1783,214872195913,89,649849,8405532131,997,53,73,59,34877
%N A262375 Smallest prime factor of 4*n! - 1.
%C A262375 The larger terms (conjectured: records) are those whose indices are listed in A099350.
%H A262375 Chai Wah Wu, <a href="/A262375/b262375.txt">Table of n, a(n) for n = 0..92</a> (n = 0..60 from Vincenzo Librandi)
%t A262375 Table[FactorInteger[4 n! - 1][[1, 1]], {n, 0, 45}] (* _Michael De Vlieger_, Sep 21 2015 *)
%o A262375 (PARI) a(n)=A020639(n!*4-1)
%o A262375 (PARI) a(n) = factor(4*n!-1)[1,1] \\ _Michel Marcus_, Sep 20 2015
%o A262375 (Magma) [PrimeDivisors(4*Factorial(n)-1)[1]: n in [0..50]]; // _Bruno Berselli_, Sep 21 2015
%Y A262375 Cf. A099350, A020639.
%K A262375 nonn
%O A262375 0,1
%A A262375 _M. F. Hasler_, Sep 20 2015