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 A352736 #12 May 08 2022 08:50:29
%S A352736 2,2,2,1,6,3,448,107,104,1,4556,1,24124,121209,368,177817,48330,1
%N A352736 a(n) is the smallest b >= 2 such that 1 + Sum_{k=0..n} b^(2^k) is prime, or 1 if no such b exists.
%C A352736 Polynomial factorizations exist for n=3,9,11,17,27 and may exist for other n > 27.
%C A352736 For those n for which a proven factorization exists, b=1 results in a prime of the form n+2.
%e A352736 a(6)=448 because 448 is the smallest number b such that 1 + Sum_{k=0..6} b^(2^k) is prime.
%K A352736 nonn,hard,more
%O A352736 0,1
%A A352736 _Kellen Shenton_, Mar 30 2022
%E A352736 a(16)-a(17) from _Kellen Shenton_, May 08 2022