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Old 2020-07-17, 21:14   #23
pepi37
 
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After milion nines:)

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Mnash doesnot take in calculation is sequence has algebra factors
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Old 2020-07-17, 21:26   #24
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Quote:
Originally Posted by pepi37 View Post
Mnash doesnot take in calculation is sequence has algebra factors
so how to get the true Nash weight?

Also, I want to calculate the Nash weight for the general case (k*b^n+c)/gcd(k+c,b-1) (k>=1, b>=2, c != 0, gcd(k,c)=1, gcd(b,c)=1)
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Old 2020-07-18, 05:12   #25
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Quote:
Originally Posted by sweety439 View Post
so how to get the true Nash weight?
Read the definition of Nash weight. Apply it.
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Old 2020-07-19, 14:34   #26
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Quote:
Originally Posted by sweety439 View Post
There is a bug:

but 9*4^n-1 should have weight 0, since it is proven composite by full algebra factors (3*2^n-1) * (3*2^n+1)
The tool doesn't check for algebraic factors...
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Old 2020-08-04, 23:48   #27
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Quote:
Originally Posted by VBCurtis View Post
Read the definition of Nash weight. Apply it.
See page https://www.rieselprime.de/ziki/Riesel_k%3D1-300, 9*2^n-1 has Nash weight 1674, and 25*2^n-1 has Nash weight 1571
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Old 2020-08-04, 23:52   #28
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Also see post https://mersenneforum.org/showpost.p...7&postcount=24, some forms like 25*12^n-1 and 144*19^n-1 have zero weight.

25*12^n-1:

for even n let n = 2*q; factors to:
(5*12^q - 1) *
(5*12^q + 1)
odd n:
factor of 13

144*19^n-1:

for even n let n = 2*q; factors to:
(12*19^q - 1) *
(12*19^q + 1)
odd n:
factor of 5

Last fiddled with by sweety439 on 2020-08-04 at 23:53
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