monumenta.ch

Cassiodorus Cassiodorus, Institutiones, 2, 4, 40
Sphaericus autem numerus est qui a circulato numero multiplicatus, a se inchoans ad se convertitur, ut, verbi gratia, quinquies quini, viginti quinque. Hinc circulus, dum in se ipsum multiplicatus fuerit, facit sphaeram, id est quinquies XXV, CXXV.

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