31
This number is a prime.
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There are 31 pairs of spinal nerves in the human body. [Beedassy]
31 is the number of the French department of Toulouse where
lived
Pierre de Fermat, 'Prince of Amateurs' and father of
modern number theory. [Beedassy]
31 is the first emirp to appear in the primeth sequence:
P1 = 2 ; P2 = 3 ;
P3 = 5 ; P5 = 11 ;
P11 = 31. The next emirp 9737333 occurs
after 6 further steps and the third one is not below
1025. [Beedassy]
The only occurrence in the sequence of primes of a pair of
consecutive emirps the next one being "generated" from its
predecessor when expressed in octal scale:
3110 = 378. [Beedassy]
(There are 5 curios for this number that have not yet been approved by an editor.)
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