[seqfan] A051501
franktaw at netscape.net
franktaw at netscape.net
Fri Jul 31 04:05:09 CEST 2009
I have a couple of problems with
http://www.research.att.com/~njas/sequences/A051501
I'm not sure how to fix them.
First, the comment from T. D. Noe; specifically the statement that the
largest known prime ... is only 2^32582657-1. This statement is out of
date; as far as I can tell, the largest known prime is currently
2^43112609-1. This could obviously be corrected; but, it will likely
become out of date again. I guess what is needed is a reference to a
web site with the largest known primes.
Second, the "Extension": "The next term is too large to display and in
any case b is not known sufficiently accurately to compute it." This
suggests that one would compute more terms of the sequence by getting a
sufficiently accurate value of b, and plugging it into the formula. In
fact, just the opposite is the case: one would get a more accurate
value of b by determining the next term of the sequence, and working
backwards to determine what value of b that corresponds to. (Not that
anyone is likely to do that anytime soon.) I'm not sure how to reword
this so that it is less misleading.
Franklin T. Adams-Watters
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