The Roman numeral V stands for dwarfs ( main sequence stars) in the Yerkes spectral classification scheme.
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BENGALI ALPHABET FLASH CARDS PLUS
The number 5 is the fifth Fibonacci number, being 2 plus 3. įive is conjectured to be the only odd untouchable number and if this is the case then five will be the only odd prime number that is not the base of an aliquot tree.įive is also the only prime that is the sum of two consecutive primes, namely 2 and 3, with these indeed being the only possible set of two consecutive primes. Five is also a super-prime, and a congruent number. It is also the only number that is part of more than one pair of twin primes. It is an Eisenstein prime with no imaginary part and real part of the form 3 p − 1. Five is the first Wilson prime and the third factorial prime, also an alternating factorial. Five is the third Sophie Germain prime, the first safe prime, the third Catalan number, and the third Mersenne prime exponent. Since it can be written as 2 2 1 + 1, five is classified as a Fermat prime therefore, a regular polygon with 5 sides (a regular pentagon) is constructible with compass and an unmarked straightedge.