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d() is the number of positive divisors of n, including 1 and n itself; σ() is the sum of the positive divisors of n, including 1 and n itselfs() is the sum of the proper divisors of n, including 1 but not n itself; that is, s(n) = σ(n) − n
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.
Multiples Value SI symbol Name Value SI symbol Name 10 −1 m dm decimetre 10 1 m dam decametre 10 −2 m cm: centimetre: 10 2 m hm hectometre 10 −3 m mm: millimetre: 10 3 m km: kilometre: 10 −6 m μm: micrometre (micron) 10 6 m Mm megametre 10 −9 m nm: nanometre: 10 9 m Gm gigametre 10 −12 m pm picometre 10 12 m Tm terametre 10 −15 m fm
Some of the SI prefixes denote negative powers of 10, i.e. division by a multiple of 10 rather than multiplication by it. Several common-use numerical prefixes denote vulgar fractions . Words containing non-technical numerical prefixes are usually not hyphenated.
The trigonometric functions of angles that are multiples of 15°, 18°, or 22.5° have simple algebraic values. These values are listed in the following table for angles from 0° to 45°. [ 1 ] In the table below, the label "Undefined" represents a ratio 1 : 0. {\displaystyle 1:0.}
Even and odd numbers: An integer is even if it is a multiple of 2, and is odd otherwise. Prime number: A positive integer with exactly two positive divisors: itself and 1. The primes form an infinite sequence 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, ...
M = 15 The 15 perfect matchings of K 6 15 as the difference of two positive squares (in orange).. 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 Bar Song (Tipsy)" by Shaboozey is the longest-running number-one song of the year and the decade with nineteen weeks atop the chart so far. [1] " I Had Some Help " by Post Malone featuring Morgan Wallen achieved the highest weekly sales and streams for a song in 2024. [ 2 ] "