A225254 - OEIS

%I #14 Oct 14 2023 00:04:28

%S 1,4,12,25,43,67,95,130,169,215,267,324,385,454,527,606,692,784,880,

%T 983,1090,1205,1325,1449,1578,1716,1860,2008,2162,2323,2488,2661,2838,

%U 3022,3210,3403,3605,3813,4025,4242,4464,4695,4930,5173,5420,5673,5933,6197

%N Number of distinct values of the sum of 3 products of two 0..n integers.

%H R. H. Hardin, <a href="/A225254/b225254.txt">Table of n, a(n) for n = 0..999</a>

%o (Python)

%o from itertools import combinations_with_replacement

%o def A225254(n): return len({sum(x) for x in combinations_with_replacement({i*j for i in range(n+1) for j in range(i+1)},3)}) # _Chai Wah Wu_, Oct 13 2023

%Y Row 3 of A225252.

%K nonn

%O 0,2

%A _R. H. Hardin_, May 04 2013

%E a(0)=1 prepended by _Alois P. Heinz_, Oct 13 2023