The Theoretic Arithmetic of the Pythagoreans by Thomas Taylor

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Theoretic Arithmetic contains the substance of all that has been written on this subject by Theo of Smyrna, Nicomachus, Iamblichus, and Boetius, together with some remarkable particulars respecting perfect, amicable, and other numbers which are not to be found in the writings of any ancient or modern mathematicians. Likewise, it includes specimens of the manner in which the Pythagoreans philosophized about numbers, and a development of their mystical and theological arithmetic.

Weiser, 1975.
ISBN: 9780877282143. 248 pp.
Second impression.
Introductory essay by Manly P. Hall.
Hardcover. Very good in a very good jacket.