I don't rightly know. In number theory, though, a lucky number is generated from a set by something called a sieve.
Usually lucky numbers is determined by us by a certain sieve from it being natural. Do you b buy things in groups of 7?
you know what, my favorite number is 7 Oh, OK, that's the number between 6 and 8. really? tell me more Early on, Hindus would write 7 like an upside-down J. Oh, that's neat. Why is seven a lucky number?
In number theory, a lucky number is a natural number in a set which is generated by a certain ''sieve''.