Perhaps the numeral seven is considered the most mystical of all numbers because it is the one number which cannot be divided evenly into the circle. This is always a dividend as the following chart illustrates:
Further references to the numeral seven:
The dividend from the division of the circle by the number seven is intriguingly close to the outer angle of the Great Pyramid: 51 degrees and 51 minutes.
The mystical nature of Pi: The number 22 is considered symbolic of a complete circle, or the circle, because this is reflected by the twenty-two letters in the Hebrew alphabet, the twenty-two keys in the Major Arcana of the Tarot (Keys 1 – 21, plus the Fool) and indicating the full circle of experience. The function 22/7, one cycle of human experience divided by the spiritual Seven or Divinity within. This function is the value of Pi; or, the closet to it as can be expressed in whole digits. The discovery of Pi was a significant breakthrough in mathematics because its value is the relationship between the circumference of a circle and its radius and diameter; Pi presented humankind with a formula by which these things might be easily measured. A.G.H.
Bunker, Dusty, Numerology, Astrology and Dreams, West Chester, PA, Whitford Press, 1987.