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 A064669 #5 Mar 30 2012 16:49:13 %S A064669 1,2,3,7,8,40,64,73,101,103,121,149,223,241,251,269,331,359,383,467, %T A064669 499,503,509,617,673,739,773,797,823,829,1031,1213,1279,1307,1381, %U A064669 1487,1489,1543,1583,1621,1667,1721,1741,1753,1777,1831,1873,1879 %N A064669 Regard A064413 as giving a permutation of the positive integers; sequence gives (presumed) smallest term in each cycle of this permutation. %H A064669 J. C. Lagarias, E. M. Rains and N. J. A. Sloane, <a href="http://arXiv.org/abs/math.NT/0204011">The EKG sequence</a>, Exper. Math. 11 (2002), 437-446. %H A064669 <a href="/index/Ed#EKG">Index entries for sequences related to EKG sequence</a> %e A064669 Permutation has cycles (1) (2) (3, 4, 6, 9, 10, 5) ( ..., 20, 18, 12, 7, 14, 13, 28, 26, ...) (8) ... %Y A064669 Cf. A064413, A064665-A064668, A064793, A064794. %K A064669 nonn %O A064669 1,2 %A A064669 _N. J. A. Sloane_, Oct 11 2001