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Many properties of a natural number n can be seen or directly computed from the prime factorization of n.. The multiplicity of a prime factor p of n is the largest exponent m for which p m divides n.
558 = 2 × 3 2 × 31. It is: a nontotient. a repdigit in bases 30 (II 30) and 61 (99 61). a Harshad number. The sum of the largest prime factors of the first 558 is itself divisible by 558 (the previous such number is 62, the next is 993). in the title of the Star Trek: Deep Space Nine episode "The Siege of AR-558"
1672 = 41 2 - 3 2, the only way to express 1672 as a difference of prime squares [245] 1673 = RMS number [385] 1674 = k such that geometric mean of phi(k) and sigma(k) is an integer [296] 1675 = Kin number [386] 1676 = number of partitions of 34 into parts each of which is used a different number of times [307]
3 Small number of something Quartet: 4 Referring to people working or collaborating especially in musical performance Great gross: 1,728 A dozen gross (12x144) Hat-trick: 3 The achievement of, a generally positive feat, three times in a game, or another achievement based on the number three [6] Several: 3+ Three or more but not many. Small ...
Several other prefixes, including 800-484, 800-703, 800-744, and 800-904 are reserved by the FCC. NPA-911 is forbidden as 9-1-1 is an emergency telephone number. (This is less restrictive than the rules prohibiting all three-digit N-1-1 codes as exchanges in all geographic area codes.)
The modern statutory definition of Imperial units, the Weights and Measures Act 1985 as amended by The Units of Measurement Regulations 1994, defines the quarter as a unit of mass equal to 28 pounds. [6] In measures of weight and mass at the time of Magna Carta, the quarter was 1 ⁄ 4 ton or (originally 500 pounds).
where f (2k−1) is the (2k − 1)th derivative of f and B 2k is the (2k)th Bernoulli number: B 2 = 1 / 6 , B 4 = − + 1 / 30 , and so on. Setting f ( x ) = x , the first derivative of f is 1, and every other term vanishes, so [ 15 ]
Today's US teaspoon is equivalent to exactly 4.92892159375 ml, which is also 1 ⁄ 6 US fluid ounces, 1 + 1 ⁄ 3 US fluid drams, [5]: C-18 or 80 US minims. [5]: C-5 C-5 While pharmaceuticals are measured nowadays exclusively in metric units, fluid drams are still used to measure the capacity of pill containers .