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 A127556 #5 Jul 09 2023 19:30:57
%S A127556 4,1,6,3,6,6,3,5,1,4,7,3,3,2,9,1,2,7,7,0,4,7,3,6,8,7,8,3,7,9,4,6,0,1,
%T A127556 1,3,5,8,0,5,7,6,4,4,9,7,4,6,3,7,4,3,9,6,9,1,5,9,0,3,6,9,5,1,4,8,8,9,
%U A127556 8,3,6,6,8,4,4,8,0,3,1,3,7,5,7,8,0,5,3,7,9,7,1,6,5,3,8,4,7,2,6,7
%N A127556 Decimal expansion of the number 4.1636635147332912770473687837946011358... having continued fraction expansion 4, 6, 9, 12, 15, 18, 21, 26, 30, 34, 39, ... (arithmetical average of two consecutive odd primes A024675).
%t A127556 a = {}; Do[AppendTo[a, (Prime[n] + Prime[n + 1])/2], {n, 2, 500}]; RealDigits[N[FromContinuedFraction[a], 100]][[1]]
%Y A127556 Cf. A064442, A127549, A127550, A127551, A127552, A127553, A127555, A127556, A127557, A127558, A127559, A024675.
%K A127556 cons,nonn
%O A127556 1,1
%A A127556 _Artur Jasinski_, Jan 18 2007
%E A127556 a(100) corrected by _Sean A. Irvine_, Jul 09 2023