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Saturday, September 24, 2016

Entry 19

The value of the infinitely nested radicalF(m)=m1+m1+m1+m1+for integer m>1 is well-known to be an algebraic number of degree m. For m=2, it is the golden ratio while m=3 yields the plastic constant. DefineG(n)=n1+2n1+3n1+4n1+For degree n=2, Ramanujan found that it was simply3=1+21+31+41+More generallyx+1=1+x1+(x+1)1+(x+2)1+ To see this, note thatx+1=(x+1)2=1+x2+2x=1+x(x+2)2=1+x1+x2+4x+3=1+x1+(x+1)(x+3)2=However, closed-forms for higher n such as G(3)1.702219132695458 are not known.

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