31

This number is a prime.

Just showing those entries submitted by 'Beedassy': (Click here to show all)

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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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