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 A078259 #11 Jun 25 2025 19:27:36 %S A078259 10,100,200,10000,100000,10000000,1000000000,20000000000, %T A078259 10000000000000,1000000000000000,100000000000000000, %U A078259 10000000000000000000,40000000000000000000,100000000000000000000000,10000000000000000000000000,1000000000000000000000000000 %N A078259 a(n) = denominator(N), where N = 0.135..(2n-1) is the concatenation of the first n odd numbers after decimal point. %p A078259 a:= n-> (t-> denom(t/10^length(t)))(parse(cat(2*i-1$i=1..n))): %p A078259 seq(a(n), n=1..16); # _Alois P. Heinz_, Jun 25 2025 %Y A078259 Cf. A019519, A031312. %K A078259 base,frac,nonn %O A078259 1,1 %A A078259 _Amarnath Murthy_, Nov 24 2002 %E A078259 Corrected and extended by _Sascha Kurz_, Jan 04 2003 %E A078259 a(4)-a(5) corrected and more terms from _Sean A. Irvine_, Jun 25 2025