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 A106152 #16 Jan 14 2017 04:31:15 %S A106152 1,0,0,2,6,6,0,6,4,0,6,0,9,1,9,7,6,5,6,8,7,4,4,0,2,1,3,9,5,9,8,9,0,0, %T A106152 4,4,5,8,2,4,3,7,5,5,5,2,8,2,2,8,7,8,3,8,4,8,4,9,6,3,1,8,6,8,3,6,0,9, %U A106152 7,7,2,3,1,1,2,2,9,6,3,7,2,7,8,1,7,1,4,7,4,5,9,0,5,3,1,8,4,4,0,4,1,5,2,6,7 %N A106152 Decimal expansion of sqrt(Pi^2 - e^2)/(Pi/2). %C A106152 Simple expression with value close to integer. %H A106152 G. C. Greubel, <a href="/A106152/b106152.txt">Table of n, a(n) for n = 1..5000</a> %F A106152 c = sqrt(Pi^2 - e^2)/(Pi/2). %e A106152 1.0026606406091976568744021395989004458243755528228783848496318683.. %t A106152 RealDigits[N[Sqrt[Pi^2 - E^2]/(Pi/2), 120]][[1]] %o A106152 (PARI) 2*sqrt(Pi^2 - exp(2))/Pi \\ _G. C. Greubel_, Jan 13 2017 %Y A106152 Cf. A019669, A096437. %K A106152 cons,nonn %O A106152 1,4 %A A106152 _Zak Seidov_, May 07 2005