I don't know much about math, but if i understand you formula the prime 13,466,917 contains 8 digits and is 8 * 2.3 = 18,4 so the 18th or 19th prime?
>To Whom It May Concern: > >I have devised a method of easily figuring out > >approximately how many prime numbers are before > >a given prime. Here it is: since the natural > >logarithm of a number increases +2.3 for every > >power of 10, the 39th Mersenne Prime, since it > >contains 4,053,946 digits, is the 4,053,945*2.3= > >9,324,074th prime number. Even more sophisticated > >methods can come even closer, it might make it easier > >to find unknown primes. > > Sincerely yours, > Danny Karl Fleming > _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
