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 A096488 #18 Apr 05 2021 20:37:31
%S A096488 2,3,2,8,2,37,2,76,2,217,2,870,2,583,2,5034,2,28494,2,10058,2,187966,
%T A096488 2,383291,2,340992,2
%N A096488 Number of different terms in a period of continued fraction for square root of n-th repunit.
%t A096488 Do[Print[Length[Union[Last[ContinuedFraction[((-1+10^n)/9)^(1/2)]]]]], {n, 2, 18}]
%o A096488 (Python)
%o A096488 from sympy.ntheory.continued_fraction import continued_fraction
%o A096488 from sympy import sqrt
%o A096488 def A096488(n): return len(set(continued_fraction(sqrt((10**n-1)//9))[-1])) # _Chai Wah Wu_, Mar 30 2021
%Y A096488 Cf. A002275, A096485, A096487.
%K A096488 nonn,more
%O A096488 2,1
%A A096488 _Labos Elemer_, Jun 25 2004
%E A096488 Name edited by _Michel Marcus_, Aug 22 2019
%E A096488 a(19)-a(22) from _Daniel Suteu_, Aug 22 2019
%E A096488 a(23)-a(28) from _Chai Wah Wu_, Apr 05 2021