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80 is: the sum of Euler's totient function φ( x ) over the first sixteen integers. a semiperfect number , since adding up some subsets of its divisors (e.g., 1 , 4 , 5 , 10 , 20 and 40 ) gives 80.
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 ...
It is the third (or second) dodecahedral number, [4] and the sum of the first seven triangular numbers (1, 3, 6, 10, 15, 21, 28), which makes it the seventh tetrahedral number. [5] The number of divisors of 84 is 12. [6] As no smaller number has more than 12 divisors, 84 is a largely composite number. [7]
And it's just one of many very strange but fascinating tidbits that can be found on the Weird Facts IG page. Over 1.2 million people follow the account for their daily dose of oddly interesting ...
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.
The symbolic number of the Hells Angels Motorcycle Club. 'H' and 'A' are the 8th and 1st letter of the alphabet, respectively. [8] 81 (八一) is referenced in flags and symbols of the People's Liberation Army as it was founded on August 1 (8/1).
Image credits: cwood1973 #2. In Japan, only 100% fruit juice can display a realistic cut fruit on the label, 95% may display a whole but unsliced fruit. 5% or less, it is forbidden to display a ...
an octahedral number. [2] a centered triangular number. [3] a centered square number. [4] a decagonal number. [5] the smallest number that can be expressed as a sum of two squares, with all squares greater than 1, in two ways, 85 = 9 2 + 2 2 = 7 2 + 6 2. [6] the length of the hypotenuse of four Pythagorean triangles. a Smith number in decimal. [7]