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Old 2020-07-21, 07:41   #26
kar_bon
 
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Mar 2006
Germany

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Quote:
Originally Posted by sweety439 View Post
No, it just have to > all prime factors of gcd(k+-1,b-1), thus we can sieve start with p=5 (...)
"We can" but srsieve won't. The error message when trying to sieve from P0<=43 for 13*43^n-1 is:
Code:
ERROR: Sieve range P0 <= p <= P1 must be in 43 < P0 < P1 < 2^62.
That's why you have to change the header of the sieve first before sieving. Try it.
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