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 A242835 #28 Oct 29 2020 18:53:38
%S A242835 2,223,22360679774997896964091
%N A242835 Primes formed by the initial digits of the decimal expansion of the square root of 5.
%C A242835 There is no other term with less than 111 digits.
%C A242835 a(4) has 1506 digits. - _Hiroaki Yamanouchi_, Sep 11 2014
%e A242835 Decimal expansion of sqrt(5) begins: 2.23606797749978969640917366... - _Wesley Ivan Hurt_, May 26 2014
%t A242835 Module[{d=25,f},f=RealDigits[Sqrt[5],10,d][[1]];Select[ Table[ FromDigits[ Take[f,n]],{n,d}],PrimeQ]] (* _Harvey P. Dale_, Oct 29 2020 *)
%Y A242835 Cf. A005042, A007512, A072952, A119343.
%Y A242835 Cf. A002163 (Decimal Expansion of sqrt(5)).
%K A242835 nonn,base,bref
%O A242835 1,1
%A A242835 _Felix Fröhlich_, May 23 2014