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 A166531 #20 Aug 24 2025 11:44:24 %S A166531 1,2,4,7,2,5,7,1,5,6,0,1,9,6,3,7,3,0,4,8,5,6,1,0,7,5,2,0,0,1,8,0,7,4, %T A166531 5,5,2,5,6,6,8,2,4,5,8,5,8,6,2,9,9,5,2,7,2,1,7,3,3,6,8,8,1,5,7,9,4,0, %U A166531 8,5,4,9,5,7,9,2,2,9,9,6,2,1,0,9,3,7,4,3,9,9,9,9,9,3,6,5,4,1,8,7,4,6,8,9,7 %N A166531 Decimal expansion of A060295^5. %C A166531 A large near-integer obtained by taking the Ramanujan constant e^(Pi*sqrt(163)) to the fifth power. %D A166531 Henri Cohen, A Course in Computational Algebraic Number Theory, 3., corr. print., Springer-Verlag Berlin Heidelberg New York, 1996 pp. 383. %H A166531 Math Overflow, <a href="http://mathoverflow.net/questions/4775/why-are-powers-of-exppisqrt163-almost-integers">Questions</a> [From _Mark A. Thomas_, Oct 02 2010] %H A166531 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/AlmostInteger.html">Almost Integer</a> %H A166531 Wikipedia, <a href="http://en.wikipedia.org/wiki/Heegner_number">Heegner number</a> %F A166531 Equals exp(5*Pi*sqrt(163)) = A166529*A166528. %e A166531 Equals 1247257156019637304856107520018074552566824585862995272173368815\ %e A166531 794085495792299621093743.99999365418746... %t A166531 RealDigits[Exp[Pi Sqrt[163]]^5,10,120][[1]] (* _Harvey P. Dale_, Aug 24 2025 *) %Y A166531 Cf. A166528, A166529, A166530, A166532. %K A166531 nonn,cons,changed %O A166531 88,2 %A A166531 _Mark A. Thomas_, Oct 16 2009 %E A166531 Keyword:cons added by _R. J. Mathar_, Feb 27 2010 %E A166531 Previous Mathematica program replaced by _Harvey P. Dale_, Aug 24 2025