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15 is: The eighth composite number and the sixth semiprime and the first odd and fourth discrete semiprime; [1] its proper divisors are 1, 3, and 5, so the first of the form (3.q), [2] where q is a higher prime. a deficient number, a lucky number, a bell number (i.e., the number of partitions for a set of size 4), [3] a pentatope number, [4 ...
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.
For instance, Augustine of Hippo argued that the significance lay in the fact that 153 is the sum of the first 17 integers (i.e. 153 is the 17th triangular number), with 17 representing the combination of divine grace (the seven gifts of the Holy Spirit) and law (the Ten Commandments). [15] [16]
The number of the beast is described in Revelation 13:15–18. Several translations have been interpreted for the meaning of the phrase "Here is Wisdom. Let him that hath understanding count the number of the beast..." where the peculiar Greek word ψηφισάτω (psephisato) is used. Possible translations include "to count", "to reckon" and ...
Explicitly state the number of significant figures (the abbreviation s.f. is sometimes used): For example "20 000 to 2 s.f." or "20 000 (2 sf)". State the expected variability (precision) explicitly with a plus–minus sign, as in 20 000 ± 1%. This also allows specifying a range of precision in-between powers of ten.
Forty-two (42) is the sixth pronic number [ 1] and the eighth abundant number, [ 2] with an abundance of 12, [ 3] equal to the average of its eight divisors as an arithmetic number. [ 4][ 5] Its prime factorization makes it the second sphenic number, and also the second of the form . [ 6] 42 is the aliquot sum of 30, [ 7] the smallest sphenic ...
13 (thirteen) is the natural number following 12 and preceding 14.. Strikingly folkloric aspects of the number 13 have been noted in various cultures around the world: one theory is that this is due to the cultures employing lunar-solar calendars (there are approximately 12.41 lunations per solar year, and hence 12 "true months" plus a smaller, and often portentous, thirteenth month).
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.