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 A089285 #12 Mar 14 2025 19:00:25
%S A089285 4,32,474,4550,38688,314160,5890500,47154384,627314688,4227938208,
%T A089285 44474529792,471238898040,3384209127992,31609375538016,
%U A089285 321468276096000,3397292023738536,63981878014882800,314159266666564480,6855058424082419712,61964634989789392896
%N A089285 Sum of divisors of floor(Pi*10^n), Pi=3.14...
%H A089285 Tyler Busby, <a href="/A089285/b089285.txt">Table of n, a(n) for n = 0..200</a>
%F A089285 a(n) = A000203(A011545(n)).
%e A089285 n=4: floor(Pi*10^4) = 31415 with divisors: {1, 5, 61, 103, 305, 515, 6283, 31415}: a(4) = 1 + 5 + 61 + 103 + 305 + 515 + 6283 + 31415 = 38688.
%Y A089285 Cf. A000203, A011545, A089284, A089286, A089287, A000796.
%K A089285 nonn
%O A089285 0,1
%A A089285 _Reinhard Zumkeller_, Oct 30 2003
%E A089285 a(18)-a(19) from _Tyler Busby_, Mar 14 2025