Still Waters Posted January 17, 2014 #1 Share Posted January 17, 2014 It is one the oldest mathematical problems in the world. Several centuries ago, the twin primes conjecture was formulated. As its name indicates, this hypothesis, which many science historians have attributed to the Greek mathematician Euclid, deals with prime numbers, those divisible only by themselves and by one (2, 3, 5, 7, 11, etc.). Under this assumption, there exists an infinite number of pairs of prime numbers whose difference is two, called twin primes (e.g., 3 and 5), but nobody has been able to confirm this so far. http://phys.org/news...-unraveled.html 1 Link to comment Share on other sites More sharing options...
Sir Wearer of Hats Posted January 17, 2014 #2 Share Posted January 17, 2014 In fact, I can think of only two - 3 & 5 and 5 & 7. Link to comment Share on other sites More sharing options...
spud the mackem Posted January 17, 2014 #3 Share Posted January 17, 2014 In fact, I can think of only two - 3 & 5 and 5 & 7. 71..73 maybe ? Link to comment Share on other sites More sharing options...
badeskov Posted January 18, 2014 #4 Share Posted January 18, 2014 In fact, I can think of only two - 3 & 5 and 5 & 7. 11, 13; 17, 19, ... Cheers, Badeskov Link to comment Share on other sites More sharing options...
Skep B Posted January 18, 2014 #5 Share Posted January 18, 2014 its really not that difficult once you get to a certain point. 1:3 3:5 11:13 41:43 aside from times when the digits repeat such as in 33, or multiples of prime numbers themselves (21) then numbers ending in 3 or 1 are going to be prime. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now