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Use Lenstra's elliptic curve factorization algorithm to factor each of the numbers N using the given...

Use Lenstra's elliptic curve factorization algorithm to factor each of the numbers N using the given elliptic curve E and point P.
a) N=26167, E: Y^2=X^3+4X+128, P=(2,12)
b) N=1386493, E: Y^2=X^3+3X-3, P=(1,1)

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