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2017-07-25, 16:33   #6
Batalov

"Serge"
Mar 2008
Phi(4,2^7658614+1)/2

23×11×107 Posts

Incidentally, I have just heard from much more knowledgeable people, and I will simply quote:

Quote:
 Originally Posted by Robert Note that the question (u-u) can be answered using the Lambert W function. But, of course, one still must compute the answer numerically via series/Pade approximant, etc. Note that the W function is not real-analytic. Bob