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Taylor - Theoretic Arithmetic.pdf - Platonic Philosophy

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Again, if 4 multiplies any triangular number, and unity is added<br />

to the product, the sum will be an hexagonal gnomon. For,<br />

4X 1 and +1= 5 the 2nd<br />

4X 3 and +1=13 the 4th hexagonal gnomon.<br />

4X 6 and + 1=25 the 7th<br />

4x10 and +1=41 the 11th<br />

&c. J<br />

And in the last place, if 4 multiplies any one of the numbers in<br />

a natural series 1, 2, 3, 4, 5, kc. and unity is added to the pre<br />

duct, the sum will likewise be an hexagonal gnomon, as is evident<br />

from what is delivered at the end of the 13th chapter.<br />

With respect to the pentad, in the first place, as Martianus<br />

Capella observes, whether it is associated with other odd numbers,<br />

or with those of its own kind, it always presents itself to<br />

the view. Thus 5>

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