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Old 2008-10-19, 02:27   #1
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Dec 2002

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Default different double checking protocol in the past?

I know that an exponent must be tested at least twice in order to be considered "verified."

However, the PrimeNet page also says this:

Double-check assignments are identical to Lucas-Lehmer assignments, however a (D) also appears to the right of the exponent. These comparatively rare tests recompute earlier residues of questionable reliability.
Were double checks "unnecessary" in GIMPS' early days or something?
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