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 A089288 #16 Mar 14 2025 21:06:58
%S A089288 2,30,156,2088,24480,314158,1570792,15697800,142466688,2074821104,
%T A089288 20847434400,157079632678,2899112679360,31222486232352,
%U A089288 306850390136136,2887898768697600,13458068181774720,314159264051394168,951904100434798080,15678880610226432000
%N A089288 Euler's totient of floor(Pi*10^n), Pi=3.14....
%H A089288 Tyler Busby, <a href="/A089288/b089288.txt">Table of n, a(n) for n = 0..200</a>
%F A089288 a(n) = A000010(A011545(n)).
%t A089288 Table[EulerPhi[Floor[Pi*10^n]],{n,0,20}] (* _Harvey P. Dale_, Dec 21 2015 *)
%Y A089288 Cf. A000796, A000010, A011545.
%K A089288 nonn
%O A089288 0,1
%A A089288 _Reinhard Zumkeller_, Oct 30 2003
%E A089288 a(18)-a(19) from _Tyler Busby_, Mar 14 2025