>> The 10,000,000 digit prime would have an exponent of over
>> 3010299.956, or 3010300
>> which is found by taking (log 2 * 10,000,000)
> Actually, it's log10(2) * 10,000,000, which is a different number. Of
> course, since I'm not at home, I can't figure out _that_ number offhand,
> but see the posts from some weeks back to get the exact first exponent.
The formula for determining the number of digits in Mp is p*log_10(2).
Therefore, to find the first one with 10^7 digits, we find ceil(10^7/log_10(2))
which is 33219281.
Yes, this is going in the FAQ...
-Lucas Wiman
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