Hi,

I'd like to present Lenstra's elliptic curve factoring method to a class.  This 
means that I'd like to define an elliptic curve over Integers(N), where N is 
composite, and then add points on that curve in sage.  I may be doing something 
stupid, but I'm getting a NotImplementedError with the method I'm using:

sage: E=EllipticCurve([0,Mod(1,59)]); E
Elliptic Curve defined by y^2 = x^3 + 1 over Ring of integers modulo 59
sage: E([0,1])
(0 : 1 : 1)
sage: E=EllipticCurve([0,Mod(1,5963)]); E
Elliptic Curve defined by y^2 = x^3 + 1 over Ring of integers modulo 5963
sage: E([0,1])
Traceback (most recent call last):
...
NotImplementedError

Is there a workaround?  Does an alternative approach allow the desired 
computations?

Thanks much in advance!

Best,
Ken R

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