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 A077687 #6 Dec 05 2013 19:55:54 %S A077687 1,21,31,46,57,67,78,803,905,1002,1103,1213,1307,1409,1511,1618,1717, %T A077687 1822,1915,2021,2119,2226,2323,2433,2531,2630,2734,2834,2931,3035, %U A077687 3135,3242,3341,3445,3545,3655,3749,3847,3946,4055,4154,4261,4355,4463,4562 %N A077687 a(n) = n-th squarefree number beginning with n. %Y A077687 Cf. A077336, A077677, A077678, A077679, A077680, A077681, A077682, A077683, A077684, A077685. %K A077687 base,nonn %O A077687 1,2 %A A077687 _Amarnath Murthy_, Nov 16 2002 %E A077687 More terms from _Sascha Kurz_, Jan 28 2003