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 2009-01-21, 08:01 #32 gd_barnes     May 2007 Kansas; USA 100111100111112 Posts 1625*2^361306-1 is prime This is getting stranger by the minute: Now, in addition to the previous ridiculous ratio of k=1400-1700 vs. 1700-2000 primes, we have an unbelievable 9 CONSECUTIVE NEW primes for k=1600-1700!! Although this is a little biased towards the k=1600-1700 and 1800-2000 ranges that have had little searching done on them...9 consecutive in a k=100 range? Come on, what's going on here? Where are the k=1800-2000 primes as well as others from many k's that haven't been searched for k=1400-1600 & 1700-1800? Counting all primes to remove any bias from ones previously found, since n=350K, we now have: Code: k-value # primes 1400-1500 6 1500-1600 6 1600-1700 12 1700-1800 2 1800-1900 0 1900-2000 2 [There is a k=1800-1900 already-known prime in Ian's reserved manual range so finally the barren stretch there will be broken.] Not only are primes strange, they can be downright bizarre! It's things like this that lead one to conclude that primes are not random and is a large part of the reason that we search huge ranges of k and n all at once...to ultimately help decipher the "code" of primes. Gary Last fiddled with by gd_barnes on 2009-01-21 at 08:06