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Old 2004-10-27, 11:13   #7
geoff
 
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Mar 2003
New Zealand

13·89 Posts
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I found the following two primes:

15274*5^31410+1
15506*5^39203+1

These four k have no primes for n < 50000:

10918
12988
14110
18530

I am going to stop there for now.
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