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7 is the only number D for which the equation 2 n − D = x 2 has more than two solutions for n and x natural. In particular, the equation 2 n − 7 = x 2 is known as the Ramanujan–Nagell equation. 7 is one of seven numbers in the positive definite quadratic integer matrix representative of all odd numbers: {1, 3, 5, 7, 11, 15, 33}. [19] [20]
The number 7 can be interpreted to mean "wholeness" or "completeness" especially when we look at the 7 days of creation. The creation of the world took six days, and God rested on the 7th.
Various numbers play a significant role in Jewish texts or practice. Some such numbers were used as mnemonics to help remember concepts, while other numbers were considered to have intrinsic significance or allusive meaning. Numbers such as 7, 10, 12, and 40 were known for recurring in symbolic contexts.
Numerology is an element of Isma'ili belief that states that numbers have religious meanings. The number seven plays a general role in the theology of the Ismā'īliyya, including mystical speculations that there are seven heavens, seven continents, seven orifices in the skull, seven days in a week, seven prophets, and so forth.
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The number seven was apparently the Egyptian symbol of such ideas as perfection, effectiveness, and completeness. Examples. Seven thousand barrels of red beer were used to trick Sekhmet out of killing. In her search for her husband's pieces, the goddess Isis was guarded by seven scorpions. A legendary famine lasted seven years.
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The term arithmancy is derived from two Greek words – arithmos (meaning number) and manteia (meaning divination). "Αριθμομαντεία" Arithmancy is thus the study of divination through numbers. [4] Although the word "arithmancy" dates to the 1570s, [5] the word "numerology" is not recorded in English before c. 1907. [6]