Numerology and numerological divination by systems suchasisopsephy were popular among early mathematicians likePythagoras.Today, it is no longer considered a part of mathematics,butregarded as pseudo-mathematics by modern scientists.Thisconjecture is similar to the relationships between astrologyandastronomy, and alchemy and chemistry. Numerology isoftenassociated as a practice alongside astrology, andsimilardivinatory arts.