Torsion point

The point P=(2,3) P=(2,3) on the elliptic curve y2=x3+1 y^2=x^3+1 is a torsion point. That is, nP=P+P++Pn times nP = \underbrace{P+P+\cdots+P}_{n \text{ times}} is the identity for some nonzero integer n. n. (Here ++ denotes the group law on the curve, and the identity is the point at infinity.)

Find the smallest positive integer nn for which this is true.

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