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Cycles of the unit digit of multiples of integers ending in 1, 3, 7 and 9 (upper row), and 2, 4, 6 and 8 (lower row) on a telephone keypad. Figure 1 is used for multiples of 1, 3, 7, and 9. Figure 2 is used for the multiples of 2, 4, 6, and 8. These patterns can be used to memorize the multiples of any number from 0 to 10, except 5.
In mathematics, a multiple is the product of any quantity and an integer. [1] In other words, for the quantities a and b , it can be said that b is a multiple of a if b = na for some integer n , which is called the multiplier .
Demonstration, with Cuisenaire rods, of the first four highly composite numbers: 1, 2, 4, 6. A highly composite number is a positive integer that has more divisors than all smaller positive integers.
The first 1000 primes are ... The following table lists the first 1000 primes, with 20 columns of consecutive primes in each of the 50 rows. ... [20] 12 p − 1 ≡ 1 ...
The first group of metric units are those that are at present defined as units within the International System of Units (SI). In its most restrictive interpretation, this is what may be meant when the term metric unit is used. The unit one (1) is the unit of a quantity of dimension one. It is the neutral element of any system of units. [2]
In addition to those listed in the everyday-use table, the SI includes standardised prefixes for 10 15 , 10 18 , 10 21 , 10 24 , 10 27 , and 10 30 ; and for 10 −15 , 10 −18 , 10 −21 (zepto), 10 −24 , 10 −27 , and 10 −30 . Distance marker on the Rhine: 36 (XXXVI) myriametres from Basel
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An incremental formulation of the sieve [2] generates primes indefinitely (i.e., without an upper bound) by interleaving the generation of primes with the generation of their multiples (so that primes can be found in gaps between the multiples), where the multiples of each prime p are generated directly by counting up from the square of the ...