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Old 2015-11-24, 15:57   #2
science_man_88
 
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"Forget I exist"
Jul 2009
Dumbassville

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Quote:
Originally Posted by Ale View Post
Ciao,


3 x 3 x 2 x 4 = 72 -1 = 71 (is a prime number)

now 5:

3 x 3 x 2 x 4 x 3 x 2 x 3 x 4 x 5 = 25920 -1 = 25919 (is a prime number)

.

now 6 :

3 x 3 x 2 x 4 x 3 x 2 x 3 x 4 x 5 x 3 x 2 x 4 x 3 x 4 x 5 x 6 = 223948800 -1 = 223948799 ( is a prime number)

ho isolato il
2 x 4


now 7 :


3 x 3 x 2 x 4 x 3 x 2 x 3 x 4 x 5 x 3 x 2 x 4 x 3 x 4 x 5 x 6 x 3 x 4 x 5 x 3 x 4 x 5 x 6 x 3 x 5 x 6 x 7 = 3047495270400000 -1 = 3047495270399999 ( is a prime number)

Do you understand the mechanism? then work to the 8 -9-10 ........ should be all primes larger.
I like to find patterns and all I see for the most part is that they will always produce numbers that have remainder of 5 when dividing by 6.
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