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 A153506 #12 Sep 08 2022 08:45:39 %S A153506 2,0,1,3,7,8,1,0,3,3,9,2,5,0,6,6,5,4,5,6,5,8,5,0,7,4,4,4,7,7,0,0,5,1, %T A153506 4,8,2,6,7,9,2,2,1,2,5,2,2,0,5,1,8,7,9,6,4,2,2,0,7,8,2,0,1,9,4,0,5,5, %U A153506 0,5,3,0,6,5,5,9,0,8,0,9,2,8,4,6,0,8,9,2,8,1,7,8,3,7,1,0,5,3,4,5,6,0,2,2,5 %N A153506 Decimal expansion of (e+gamma+Pi+phi)/4, where gamma is the Euler-Mascheroni constant and phi is the golden ratio. %H A153506 G. C. Greubel, <a href="/A153506/b153506.txt">Table of n, a(n) for n = 1..2500</a> %F A153506 Equals A003881+A019741+A134944+A001620/4. - _R. J. Mathar_, Jan 25 2009 %e A153506 2.01378103392506654565850744477005148267922125220518796422... %t A153506 RealDigits[(E + EulerGamma + Pi + GoldenRatio)/4, 10, 50][[1]] (* _G. C. Greubel_, Aug 17 2016 *) %o A153506 (PARI) default(realprecision, 100); phi=(1+sqrt(5))/2; (exp(1) + Euler + Pi + phi)/4 \\ _G. C. Greubel_, Aug 31 2018 %o A153506 (Magma) SetDefaultRealField(RealField(100)); R:= RealField(); phi:=(1+ Sqrt(5))/2; (Exp(1) + EulerGamma(R) + Pi(R) + phi)/4; // _G. C. Greubel_, Aug 31 2018 %Y A153506 Cf. A135000, A135001. %K A153506 nonn,cons %O A153506 1,1 %A A153506 _Omar E. Pol_, Dec 28 2008 %E A153506 More digits from _R. J. Mathar_, Jan 22 2009