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Jan 30, 2012 at 1:37 comment added Noam D. Elkies Wait, there's no curve of conductor $78$ and rank $2$, and this curve $y^2+xy+y=x^3−121830x+341716424$ has a huge conductor not divisible by either $3$ or $13$. Googling the last coefficient, I gather you made a sign error and meant $y^2+xy+y=x^3−121830x-341716424$, with conductor $79^2\cdot 78$ and rank $2$, which is the quadratic twist by $(-79)^{1/2}$ of a curve of conductor $78$. But I don't think William Stein and I wrote about this curve...
Jan 12, 2010 at 10:55 history answered Olivier CC BY-SA 2.5