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 A229483 #7 Sep 25 2013 03:46:05 %S A229483 1,3,10,13,19,22,33,38,47,53,59,69,78,82,102,107,110,115,119,129,141, %T A229483 151,161,173,182,187,206,210,215,218,227,246,258,265,274,278,309,314, %U A229483 318,327,334,346,359,367,382,389,391,397,426,429,437,446,462,465,470 %N A229483 Squarefree numbers whose indices are lucky numbers. %C A229483 Originally arose as "Lucky numbers generated from squarefree numbers" under the hypothesis that Ulam's sieve (the one used to produce lucky numbers) ignores the values of the terms. %F A229483 a(n) = A005117(A000959(n)). - _Charles R Greathouse IV_, Sep 16 2013 %Y A229483 Cf. A032605, A059987, A229205. %K A229483 nonn %O A229483 1,2 %A A229483 _Charles R Greathouse IV_ and _M. F. Hasler_, Sep 24 2013