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 A133045 #5 Oct 03 2017 02:12:17
%S A133045 3,5,1,7,2,5,7,6,5,5,3,7,4,2,9,4,9,6,7,2,9,7,1,8,4,4,6,7,4,4,0,7,3,7,
%T A133045 0,9,5,5,1,6,1,7,3,4,0,2,8,2,3,6,6,9,2,0,9,3,8,4,6,3,4,6,3,3,7,4,6,0,
%U A133045 7,4,3,1,7,6,8,2,1,1,4,5,7
%N A133045 Successive digits of Fermat numbers A000215(n).
%H A133045 G. C. Greubel, <a href="/A133045/b133045.txt">Table of n, a(n) for the first 14 Fermat numbers</a>
%t A133045 IntegerDigits[Table[2^(2^n) + 1, {n, 0, 10}]] // Flatten (* _G. C. Greubel_, Oct 03 2017 *)
%Y A133045 Cf. A000215, A033308.
%K A133045 easy,nonn,base
%O A133045 1,1
%A A133045 _Omar E. Pol_, Nov 10 2007