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 A130272 #9 Sep 15 2021 21:01:31
%S A130272 2,3,7,13,19,31,43,61,103,109,139,151,181,211,331,421,541,571,631,751,
%T A130272 919,1291,1381,1549,1579,1621,1759,1831,2011,2311,2671,3019,3469,3691,
%U A130272 3931,4909,4951,4999,5119,6211,6451,6679,8269,8719,8779,8941,9739,9949
%N A130272 Primes p for which the period of the continued fraction of sqrt(p) increases.
%H A130272 Chai Wah Wu, <a href="/A130272/b130272.txt">Table of n, a(n) for n = 1..344</a> (terms n = 1..200 from T. D. Noe)
%F A130272 Where records occur in A054269.
%t A130272 mx=0; n=0; t=Table[n++; While[p=Prime[n]; len=Length[Last[ContinuedFraction[Sqrt[p]]]]; len<=mx, n++ ]; mx=len; p, {50}]
%Y A130272 Cf. A003285, A013645.
%K A130272 nonn
%O A130272 1,1
%A A130272 _T. D. Noe_, May 19 2007