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 A114484 #23 Jul 17 2025 08:18:52
%S A114484 1,309,381600854690147056244358827361
%N A114484 Number of decimal digits in Fermat(10^n).
%C A114484 Next term a(3) has 301 digits.
%H A114484 Amiram Eldar, <a href="/A114484/b114484.txt">Table of n, a(n) for n = 0..3</a>
%H A114484 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/FermatNumber.html">Fermat Number</a>.
%F A114484 a(n) = A057755(10^n) = A055642(A000215(A011557(n))). - _Amiram Eldar_, Jul 17 2025
%t A114484 Block[{$MaxExtraPrecision = Infinity}, Table[1 + Floor[2^10^n Log[10, 2]], {n, 0, 2}]]
%Y A114484 Subsequence of A057755. - _Arkadiusz Wesolowski_, Jun 30 2011
%Y A114484 Cf. A000021, A000215, A011557, A055642.
%K A114484 nonn,base
%O A114484 0,2
%A A114484 _Eric W. Weisstein_, Nov 30 2005