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 A089289 #18 Mar 14 2025 21:07:05 %S A089289 3,31,314,1047,31415,314159,785398,31415926,104719755,3141592653, %T A089289 31415926535,314159265358,3141592653589,31415926535897, %U A089289 314159265358979,3141592653589793,2243994752564138,314159265358979323,3141592653589793238,1963495408493620774 %N A089289 Squarefree kernel of floor(Pi*10^n), Pi = 3.14.... %H A089289 Tyler Busby, <a href="/A089289/b089289.txt">Table of n, a(n) for n = 0..200</a> %F A089289 a(n) = A007947(A011545(n)). %e A089289 n=16: floor(Pi*10^16) = 31415926535897932 = 2^2 * 7^2 * 2381 * 57493 * 1170899: a(16) = 2 * 7 * 2381 * 57493 * 1170899 = 2243994752564138. %Y A089289 Cf. A000796, A007947, A011545. %K A089289 nonn %O A089289 0,1 %A A089289 _Reinhard Zumkeller_, Oct 30 2003 %E A089289 a(18)-a(19) from _Tyler Busby_, Mar 14 2025