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2005-06-06, 20:00
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#1 |
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4ED16 Posts |
Lucas test for billion bit prime
 Hello Does anyone know if i can use prime95 version 24.11 for a billion bit lucas-lehmer testing or any other such software?
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2005-06-06, 20:36
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#2 | |
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Bamboozled!
"๐บ๐๐ท๐ท๐ญ"
May 2003
Down not across
2·5·11·107 Posts |
Quote:
You can't use Prime95 itself for gigabit LL-testing, but other multiprecision math libraries could be used. How long are you prepared to wait for a single test to run? Paul |
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2005-06-06, 22:06
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#3 |
"Curtis"
Feb 2005
Riverside, CA
580310 Posts |
You understand that LL testing a billion-bit number would take roughly double your lifetime on current hardware, yes?
I believe Prime is not coded to factor *or* LL test above n=80 million; I've never heard of anyone trying such a power, but I know of no specific limitations on Proth for exponent size. However, as Proth is much less efficient code, expect it to take something near 3 lifetimes to complete one test instead of a mere 2 lifetimes, if it indeed can handle the exponent. If it is mere curiosity about the program's limits, plug such a power in to Proth and see if it spits out an error (may as well find time per iteration while you're at it, for entertainment). -Curtis |
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