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18 is a semiperfect number [1] and an abundant number. It is a largely composite number, [2] as it has 6 divisors and no smaller number has more than 6 divisors. There are 18 one-sided pentominoes. In the classification of finite simple groups, there are 18 infinite families of groups. [3]
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.
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 ...
BSc meteorologist Janice Davila tells Bored Panda that one of the most unknown facts from her field of expertise is that weather radars are slightly tilted upward in a half-degree (1/2°) angle.
And the Instagram page ‘Unbelievable Facts’ is one of the best places to do just that. Every day, they share fascinating trivia, building a collection that now includes over 10,000 unique facts.
The members of the TIL community dish out cool and interesting facts daily, ... He was able to predict certain numbers were more likely to hit next. After he won €600K, a legal case against him ...
the 23rd prime number, following 79 (of which it is also a cousin prime) and preceding 89. a Sophie Germain prime. [1] a safe prime. [2] a Chen prime. [3] an Eisenstein prime with no imaginary part and real part of the form 3n − 1. a highly cototient number. [4] the number of primes that are right-truncatable. [5] a super-prime, because 23 is ...
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