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 Pentation roots self but please you do... sheldonison Long Time Fellow Posts: 664 Threads: 23 Joined: Oct 2008 11/03/2010, 05:26 AM (10/18/2010, 12:09 AM)nuninho1980 Wrote: $y = \text{Pentaroot}_x (b) = b /\uparrow\uparrow\uparrow x \Leftrightarrow b = y \uparrow\uparrow\uparrow x$ $\text{Pentaroot}_2 (2) = ?$ $\text{Pentaroot}_3 (3) = ?$ $\text{Pentaroot}_4 (4) = ?$ $\text{Pentaroot}_5 (5) = ?$ $\lim_{x\to\infty}\text{Pentaroot}_x (x) = ?$ By the results have 5 cases decimais (minimum). Please you think to calculate on up... I have known its by program Pari/GP (it's very fast). x)Pentation is hard to understand.... Here's my results. I used "b" for the base. $b\uparrow\uparrow\uparrow n = n$, for each "n", calculate b $\text{sexp}_b(\text{sexp}_b(1))=2$, calculate b $\text{sexp}_b(\text{sexp}_b(\text{sexp}_b(1)))=3$, calculate b $\text{sexp}_b(\text{sexp}_b(\text{sexp}_b(\text{sexp}_b(1))))=4$, calculate b and so on, limit as $n \to \infty$ n= 2 1.63221539635499 n= 3 1.73480823757765 n= 4 1.73013167405422 n= 5 1.71198477313212 n= 6 1.69588829898111 n=70 1.63599652477221 I calculated these values by simple binary search, but I used "\p 28", which is accurate to ~14 digits, but very fast, 4 seconds for init(B);loop. Only problem is its very easy to get an overflow, so the initial starting based needs to readjusted; for n=70, I used a more complicated algorithm. Code:\r kneser.gp \p 28; { curbase=1.6;   curstep=0.1;   while ((curstep>1E-14),     init(curbase);loop;     y = sexp(sexp(B));     if (y>3, curbase=curbase-curstep, curbase=curbase+curstep);     curstep=curstep/2;   ); } As n goes to infinity, I would expect the value for b to go to Nuinho's constant, the base for which the upper fixed point of sexp is parabolic, b=1.635324496715276399345344618306171 - Sheldon « Next Oldest | Next Newest »

 Messages In This Thread Pentation roots self but please you do... - by nuninho1980 - 10/18/2010, 12:09 AM RE: Pentation roots self but please you do... - by sheldonison - 11/03/2010, 05:26 AM RE: Pentation roots self but please you do... - by nuninho1980 - 11/03/2010, 12:54 PM

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