7
This number is a prime.
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Seven is the only odd prime that becomes "even" by deleting a letter. [Beedassy]
Whilst every Fibonacci prime number has odd prime subscript, 7 is the first prime not appearing in the Fibonacci sequence. [Beedassy]
The smallest prime NSW number. [Beedassy]
It is possible to
construct
an angle of π/7 using 7 matchsticks. [Beedassy]
The smallest prime subscript n such that
pn+1 is the first prime dividing
#pn+1, (pn being the
nth prime ). [Beedassy]
The normal human head bears 7 sense organ openings: 2 eye sockets, 2 ear canals, 2 nostrils, and a mouth. [Beedassy]
The largest known prime p such that p! + 1
is the square of a prime. [Beedassy]
The only odd prime p whose n-th power
pn, for any nonzero n below
p, has exactly n digits. [Beedassy]
The number of distinct four of fewer face-joined unit cubes
forming the polycube pieces of the 3-by-3-by-3 Soma cube
dissection puzzle invented by Piet Hein in 1936. [Beedassy]
The only known number whose factorial has 50% of its digits consisting of 0's: 7! = 5040. [Beedassy]
H-7 is the heaviest isotope of hydrogen observed
experimentally in a heavy particle accelerator. [Beedassy]
The French version of the popular cartoon Spot the difference puzzle is called "Le jeu des 7
erreurs" (meaning 'The 7 mistakes game'). [Beedassy]
The standard ASCII (American Standard Code for
Information Interchange) character codes for encoding
symbols on a typical American keyboard were originally 7
bits long. [Beedassy]
Number Theorist James Maynard received an award by The
European Mathematical Society for his 2016 paper in which he
proved there are infinitely many primes devoid of any one
of the digits, and he used the rare property of primes
without digit 7 as a test case. [Beedassy]