Thread: 1000039*2^n+1
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Old 2021-03-23, 15:33   #6
rogue
 
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"Mark"
Apr 2003
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Quote:
Originally Posted by Alex View Post
Thank you, rogue.

Thank you, bur.
I`ve chosen k=1000039 because it is wellsieved.
For the comparison sieving n=[1..1000000] up to p<1e6:
k=1000039 has 16891 candidates
k=1281979 has 39706 candidates

k=1000039 has only 7 known small primes, it is not Sierpinski number.
Now I have found several less candidates k, but k=1000039 was the first.
I use Sr1sieve & PFGW.
llr is probably faster than pfgw for these numbers.
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