cp's OEIS Frontend

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.

A226359 Number of ordered triples (i,j,k) with |i|, |j|, |k|, |i*j*k| <= n.

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%I A226359 #21 Jun 06 2013 14:19:47
%S A226359 1,27,93,183,321,459,669,855,1121,1379,1685,1967,2393,2723,3125,3551,
%T A226359 4049,4475,5045,5519,6137,6707,7301,7871,8681,9323,10013,10735,11545,
%U A226359 12259,13189,13951,14881,15739,16621,17527,18673,19579,20557,21559,22753,23755
%N A226359 Number of ordered triples (i,j,k) with |i|, |j|, |k|, |i*j*k| <= n.
%H A226359 Robert Price and Charles R Greathouse IV, <a href="/A226359/b226359.txt">Table of n, a(n) for n = 0..10000</a> (terms through 100 from Robert Price)
%t A226359 f[n_]:=Length[Complement[Union[Flatten[Table[If[Abs[i*j*k] <=  n, {i, j, k}], {i, -n, n}, {j, -n, n}, {k, -n, n}], 2]], {Null}]]; Table[f[n], {n, 0, 100}]
%o A226359 (PARI) a(n)=12*n^2+6*n+1+8*sum(i=1, n, n\i*numdiv(i)) \\ _Charles R Greathouse IV_, Jun 04 2013
%Y A226359 Cf. A100450, A226357.
%K A226359 nonn
%O A226359 0,2
%A A226359 _Robert Price_, Jun 04 2013