login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

There are exactly n integer-sided triangles of area a(n).
3

%I #6 Nov 04 2019 09:34:10

%S 6,12,126,60,240,210,1080,336,1260,924,2016,2640,5280,11424,420,2520,

%T 840,5544,3696,14280,3360,25200,1680,6720,10920,26880,15960,137280,

%U 23100,43680,64680,21840,32760,24024,13860,7560,68040,49140,262080,60480,73920,133056,207900

%N There are exactly n integer-sided triangles of area a(n).

%C If integer-sided triangle has integer area, area is divisible by 6.

%H Giovanni Resta, <a href="/A051586/b051586.txt">Table of n, a(n) for n = 1..75</a>

%Y Cf. A051584, A051585.

%K nonn

%O 1,1

%A _David W. Wilson_

%E More terms from _Giovanni Resta_, Nov 04 2019