Tag » Eratosthenes

Sieve of Eratosthenes

everybody has already read about the the ancient Greek mathematician Eratosthenes (250 BCE).  A basic algorithm could be found at http://en.wikipedia.org/wiki/Sieve_of_Eratosthenes

but why in the optimizing algorithm, the variable i should not exceed square root of n ? 113 more words


The Dog-Star: Dionysus, Ikarios and a Daughter's Dog ( D Scholia, Il. 22.29)

Of Orion: calls this, then, the dog-star. Some say that this dog transformed into a star is not Orion’s but instead is Erigonê’s, and that it was made into a star for the following reason. 196 more words