cp's OEIS Frontend

A085383 Triangle read by rows, 1 <= k <= n: T(n,k) = floor(n/k)*ceiling(n/k).

%I A085383 #11 Jan 01 2023 13:41:32
%S A085383 1,4,1,9,2,1,16,4,2,1,25,6,2,2,1,36,9,4,2,2,1,49,12,6,2,2,2,1,64,16,6,
%T A085383 4,2,2,2,1,81,20,9,6,2,2,2,2,1,100,25,12,6,4,2,2,2,2,1,121,30,12,6,6,
%U A085383 2,2,2,2,2,1,144,36,16,9,6,4,2,2,2,2,2,1,169,42,20,12,6,6,2,2,2,2,2,2
%N A085383 Triangle read by rows, 1 <= k <= n: T(n,k) = floor(n/k)*ceiling(n/k).
%C A085383 T(n,1) = A000290(n);
%C A085383 T(n,2) = A002620(n) for n > 1;
%C A085383 T(n,n) = 1.
%H A085383 Harvey P. Dale, <a href="/A085383/b085383.txt">Table of n, a(n) for n = 1..1000</a>
%t A085383 Table[Floor[n/k]Ceiling[n/k],{n,20},{k,n}]//Flatten (* _Harvey P. Dale_, Jan 01 2023 *)
%Y A085383 Cf. A000290, A002620.
%K A085383 nonn,tabl
%O A085383 1,2
%A A085383 _Reinhard Zumkeller_, Aug 12 2003