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When written in base 10, all multiples of 2 will end in 0, 2, 4, 6, or 8. [3] 2 is the smallest and the only even prime number, and the first Ramanujan prime. [4] It is also the first superior highly composite number, [5] and the first colossally abundant number. [6]
Famously, in a discussion between the mathematicians G. H. Hardy and Srinivasa Ramanujan about interesting and uninteresting numbers, Hardy remarked that the number 1729 of the taxicab he had ridden seemed "rather a dull one", and Ramanujan immediately answered that it is interesting, being the smallest number that is the sum of two cubes in ...
Randomly, and at this point very mysteriously, the number 2. First up, there’s the fact that the clocks in both the library and the teaser video are set to 2:00. Like, to reiterate: Three clocks ...
It is the smallest primitive abundant number, [5] and the first number to have an abundance of 2, followed by 104. [ 6 ] 20 is the length of a side of the fifth smallest right triangle that forms a primitive Pythagorean triple (20, 21 , 29 ).
The next such cluster of two square-primes comprises 2 2 × 29 = 116, and 3 2 × 13 = 117. 44 has an aliquot sum of 40, within an aliquot sequence of three composite numbers (44, 40, 50, 43, 1, 0) rooted in the prime 43-aliquot tree. Since the greatest prime factor of 44 2 + 1 = 1937 is 149 and thus more than 44 twice, 44 is a Størmer number. [3]
65 = 1 5 + 2 4 + 3 3 + 4 2 + 5 1. [9] 65 is the length of the hypotenuse of 4 different Pythagorean triangles, the lowest number to have more than 2: 65 2 = 16 2 + 63 2 = 33 2 + 56 2 = 39 2 + 52 2 = 25 2 + 60 2. [10] The first two are "primitive", and 65 is the lowest number to be the largest side of more than one such triple. [11] 65 is the ...
Seventy-two is a pronic number, as it is the product of 8 and 9. [1] It is the smallest Achilles number, as it's a powerful number that is not itself a power. [2] 72 is an abundant number. [3] With exactly twelve positive divisors, including 12 (one of only two sublime numbers), [4] 72 is also the twelfth member in the sequence of refactorable ...
It is the sixth of this form and the fifth of the form 2 2 · q. the 5th Bell number, [1] the number of ways to partition a set of 5 objects. a decagonal number. [2] with an aliquot sum of 46; within an aliquot sequence of seven composite numbers { 52, 46, 26, 16, 15, 9, 4, 3, 1, 0 } to the prime in the 3-aliquot tree. This sequence does not ...