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Old 2017-02-20, 17:47   #6
sweety439
 
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Nov 2016

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I reserved some reverse Sierpinski/Riesel problems with only <=3 bases remain and found those primes:

22*38^1579-1
27*34^3086-1
28*74^3369-1

Riesel k=27 and Riesel k=28 were proven!!!

These forms have no primes found and likely tested to at least n=5000:

27*62^n+1
28*41^n+1
22*62^n-1

Reserving 18*174^n-1, 32*54^n-1, 32*71^n-1 and 32*77^n-1.

Last fiddled with by sweety439 on 2017-02-20 at 18:00
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