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 A177874 #35 Jan 15 2025 07:06:22
%S A177874 1,2,3,5,10,19,37,74,147,293,586,1172,2343,4686,9371,18742,37484,
%T A177874 74967,149933,299866,599731,1199461,2398922,4797844,9595688,19191376,
%U A177874 38382751,76765501,153531001,307062002,614124003,1228248006,2456496012,4912992024,9825984047
%N A177874 The number of decimal digits in the Lucas-Lehmer number A003010(n).
%F A177874 a(n) = A055642(A003010(n)).
%t A177874 a=Sqrt[6]; Table[a=a^2-2; Length[IntegerDigits[a]], {n,0,20}]
%t A177874 IntegerLength/@NestList[#^2-2&,4,33] (* _Harvey P. Dale_, Jan 19 2018 *)
%o A177874 (Magma) T:=[ n eq 1 select 4 else Self(n-1)^2-2: n in [1..24] ]; [ #Intseq(T[n]): n in [1..#T] ];
%Y A177874 Cf. A003010.
%K A177874 nonn,base
%O A177874 0,2
%A A177874 _G. L. Honaker, Jr._, Dec 13 2010
%E A177874 a(21)-a(24) from _Klaus Brockhaus_, Dec 13 2010
%E A177874 a(25)-a(32) from _D. S. McNeil_, Dec 13 2010
%E A177874 a(33)-a(34) from _Jinyuan Wang_, Jan 15 2025