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 A155970 #18 Aug 05 2021 20:48:00
%S A155970 0,0,0,0,0,4,8,4,8,1,3,6,8,1,1,0,9,5,3,5,9,9,3,5,8,9,9,1,4,1,0,2,3,5,
%T A155970 7,9,4,7,9,7,5,9,5,6,3,5,3,3,0,2,3,7,2,7,0,1,5,1,5,5,8,2,5,5,3,1,7,7,
%U A155970 8,2,5,2,8,0,3,0,9,6,1,2,0,6,9,2,8,9,9,1,1,7,3,3,7,6,9,3,4,2,9,1,9,3,0,0,6
%N A155970 Decimal expansion of the conversion factor of arcseconds to radians.
%C A155970 One arcsecond is a popular astronomic angular unit, 1/3600 of a degree.
%H A155970 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>
%F A155970 A019685/3600.
%e A155970 Equals 4.8481368110953599358..*10^(-6).
%p A155970 evalf(Pi/180/3600);
%t A155970 Join[{0,0,0,0,0},RealDigits[Pi/648000,10,120][[1]]] (* _Harvey P. Dale_, Apr 04 2015 *)
%o A155970 (PARI) Pi/648000 \\ _Charles R Greathouse IV_, Sep 08 2011
%Y A155970 Cf. A217572 (inverse). - _Stanislav Sykora_, Feb 04 2014
%K A155970 cons,easy,nonn
%O A155970 0,6
%A A155970 _R. J. Mathar_, Jan 31 2009