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 A001467 M4464 N1893 #27 Mar 07 2015 11:55:54 %S A001467 1,1,1,7,-791,-3748629,151648960887729, %T A001467 -1323497544567561138595307148089, %U A001467 41444465282455711991644958522615049159671653083333293470875123 %N A001467 Denominators of an expansion for Pi. %D A001467 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %D A001467 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A001467 Mohammad K. Azarian, <a href="http://www.jstor.org/stable/27646572">An Expression for Pi, Problem #870</a>, College Mathematics Journal, Vol. 39, No. 1, January 2008, p. 66. <a href="http://www.jstor.org/stable/27646723">Solution</a> appeared in Vol. 40, No. 1, January 2009, pp. 62-64. %H A001467 H. E. Salzer, <a href="http://www.jstor.org/stable/2305906">The approximation of numbers as sums of reciprocals</a>, Amer. Math. Monthly, 54 (1947), 135-142. %H A001467 J. W. Wrench, Jr., <a href="/A001466/a001466.png">Letter to N. J. A. Sloane, Mar 27 1974</a> %H A001467 <a href="/index/Ph#Pi314">Index entries for sequences related to the number Pi</a> %F A001467 Numerators are 1. %e A001467 a(4) = -791 since Pi - (1/1) - (1/1) - (1/1) - (1/7) = -0.001264489... is closer to 1/(-791) = -0.001264222... than to 1/(-790) = -0.0012658228... %o A001467 (PARI) x=Pi; for(k=0,8,if(x<1,d=round(1/x),d=1); x=x-1/d; print(d,", ")) \\ _Jaume Oliver Lafont_, Feb 21 2009 %Y A001467 Cf. A001466, A014013, A073422. %K A001467 sign,frac %O A001467 0,4 %A A001467 _N. J. A. Sloane_ %E A001467 Edited by _Henry Bottomley_, Jul 30 2002