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)=n√1+2n√1+3n√1+4n√1+…
For degree n=2, Ramanujan found that it was simply3=√1+2√1+3√1+4√1+…
More generallyx+1=√1+x√1+(x+1)√1+(x+2)√1+⋯
To see this, note thatx+1=√(x+1)2=√1+x2+2x=√1+x√(x+2)2=√1+x√1+x2+4x+3=√1+x√1+(x+1)√(x+3)2=…
However, closed-forms for higher n such as G(3)≈1.702219132695458 are not known.
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