yantra
Following McClain, we have a definition of yantra_p(n) in terms of all the p-limit integers less than or equal to n.
REFERENCES
McClain, Ernest. 1976.
The Myth of Invariance:
The Origin of the Gods, Mathematics, and Music, From the Rg Veda to Plato.
Nicolas-Hays, York Beach, Maine.
ISBN: 0-89254-012-5
McClain, Ernest. 1978.
The Pythagorean Plato: Prelude to the Song Itself.
Nicolas-Hays, York Beach, Maine.
ISBN: 0-89254-010-9