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 A143297 #13 Feb 16 2025 08:33:08
%S A143297 7,5,7,8,2,3,0,1,1,2,6,8,4,9,2,8,3,7,7,4,2,1,7,5,6,8,3,9,8,0,0,9,9,7,
%T A143297 8,2,5,2,3,6,5,8,5,8,5,6,4,6,0,8,0,1,9,7,0,2,7,0,9,5,5,5,8,6,5,4,2,4,
%U A143297 1,4,3,9,0,0,4,6,6,0,6,9,0,0,6,6,8,6,8,9,4,3,4,6,2,3,8,8,6,0,6,1,3,2,1,7,0
%N A143297 Decimal expansion of the Flajolet-Odlyzko constant.
%C A143297 Named by Finch (2003) after the French computer scientist Philippe Flajolet (1948-2011) and the Polish-American mathematician Andrew Michael Odlyzko (b. 1949). - _Amiram Eldar_, Jun 16 2021
%D A143297 Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, section 7.1, pp. 285-290.
%H A143297 Philippe Flajolet and Andrew M. Odlyzko, <a href="https://doi.org/10.1007/3-540-46885-4_34">Random mapping statistics</a>, in: J. J. Quisquater and J. Vandewalle (eds.), Advances in Cryptology - EUROCRYPT '89, Springer, Berlin, Heidelberg, 1990.
%H A143297 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Flajolet-OdlyzkoConstant.html">Flajolet-Odlyzko Constant</a>.
%e A143297 0.75782301126849283774...
%t A143297 RealDigits[ 2*NIntegrate[1 - E^(ExpIntegralEi[-t]/2), {t, 0, Infinity}, WorkingPrecision -> 110]][[1]][[1 ;; 105]]
%t A143297 (* _Jean-François Alcover_, Jun 16 2011, after _Eric W. Weisstein_ *)
%K A143297 nonn,cons
%O A143297 0,1
%A A143297 _Eric W. Weisstein_, Aug 05 2008