13 + 13 = 26
13 x 13 = 169 +
==============
sum......195
13 x 10 = 130
13 x 11 = 143
13 x 12 = 156
13 x 13 = 169 +
==========
..............598 - 585 = 13
And thirteen rows total... Nine and Four.
13 x 1 = 13
13 x 2 = 26
13 x 3 = 39
13 x 4 = 52
13 x 5 = 65
13 x 6 = 78
13 x 7 = 91
13 x 8 = 104
13 x 9 = 117 +
=========
...............585
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