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%I #14 Apr 11 2021 03:50:11
%S 3,31,314,1047,31415,314159,785398,31415926,104719755,3141592653,
%T 31415926535,314159265358,3141592653589,31415926535897,
%U 314159265358979,3141592653589793,2243994752564138,314159265358979323
%N Squarefree kernel of floor(Pi*10^n), Pi = 3.14....
%F a(n) = A007947(A011545(n)).
%e n=16: floor(Pi*10^16) = 31415926535897932 = 2^2 * 7^2 * 2381 * 57493 * 1170899: a(16) = 2 * 7 * 2381 * 57493 * 1170899 = 2243994752564138.
%Y Cf. A000796, A007947, A011545.
%K nonn
%O 0,1
%A _Reinhard Zumkeller_, Oct 30 2003