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# Old mathematical puzzle soon to be unraveled?

euclid mathematician prime numbers mathematical puzzle twin primes

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### #1 Still Waters

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Posted 17 January 2014 - 09:20 PM

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

### #2 Sir Wearer of Hats

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Posted 17 January 2014 - 10:05 PM

In fact, I can think of only two - 3 & 5 and 5 & 7.

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### #3 spud the mackem

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Posted 17 January 2014 - 11:00 PM

Sir Wearer of Hats, on 17 January 2014 - 10:05 PM, said:

In fact, I can think of only two - 3 & 5 and 5 & 7.
71..73 maybe ?

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Posted 18 January 2014 - 05:19 AM

Sir Wearer of Hats, on 17 January 2014 - 10:05 PM, said:

In fact, I can think of only two - 3 & 5 and 5 & 7.

11, 13; 17, 19, ...

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### #5 Skep B

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Posted 18 January 2014 - 05:26 AM

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.

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