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Old 2012-11-21, 05:48   #177
LaurV
Romulan Interpreter
 
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Jun 2011
Thailand

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Quote:
Originally Posted by AMDave View Post
However there is no discernible pattern for whether the mod6 'seed' is 1 above or 1 below.
Well, if you have nothing better to do, you can establish some pattern, not where the primes are, but where they are not. For example, taking in 6k-1 some k=1 (mod 5) you get 30k+5 which is always divisible by 5, therefore composite (ex: 35, 65, 95, 125, etc), and symmetrical, 30k-5 (which is 6k+1 with convenient renaming of k) (ex: 25, 55, 85, 115, 145, etc). You can repeat this for 7 (42k+/-7, ex: 35, 49, 77, 91, 119, 133), for 11 (66k+/-11, ex: 55, 77, 121, 143, 187), etc, and get a "pattern" with "where the primes are not", in the (+/-1 mod 6) distribution. They repeat after 6*5*7*11 lines
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