KK>    I did one using an integer based square root function which
KK>    only checks one less than or one greater than multiples of          
KK>    six, which all primes seem to be for some reason. :)                

 You want to know why?    all the numbers "under" 2,4,&6 in this table
                          are divisible by 2 and all the ones under
  1  2  3  4  5  6        3 and 6 are divisible by 3, this leaves only
  7  8  9  10 11 12       1 and 5 open.  you could possibly use a wider
  13 14 15 16 17 18...    table (30?) and take out multiples of 5 also.

bye.
                        

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