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 A304880 #5 May 20 2018 11:30:13 %S A304880 0,1,1,2,3,1,5,2,3,6,2,2,3,12,5,9,9,1,7,5,8,8,20,16,4,13,25,22,11,2, %T A304880 18,18,23,27,33,29,27,23,3,37,32,32,22,37,37,41,41,20,19,33,1,50,17, %U A304880 52,38,6,5,13,23,55,25,23,8,62,47,20,19,2,27,37,57,55 %N A304880 a(n) is the numerator of the smallest nonnegative fraction r such that round(10^d*r) = n, where d is the number of digits of n and Gaussian rounding (round half to even) is applied. %p A304880 # Function r is defined in A304879. %p A304880 a := n -> numer(r(n)): %p A304880 seq(a(n), n = 0..71); %Y A304880 Cf. A304879. %K A304880 nonn,frac %O A304880 0,4 %A A304880 _Peter Luschny_, May 20 2018