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Old 2017-03-08, 17:17   #11
sweety439
 
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Nov 2016

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For Sierpinski k=18, I found 2 primes:

18*74^662+1
18*239^1990+1

Thus, there are only 3 bases remain for Sierpinski k=18: 18, 227, 293. b=18 was already tested to n=2^25-2 with no prime found, b=227 was already tested to n=1M with no prime found, for b=293, I found no prime, it is likely tested to at least n=5000.
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