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Kernel: SageMath 8.8

SageMath 8.8 on CoCalc

Kernel: SageMath 8.8

version()
EllipticCurve('420a').plot()
var('a b c d k') d = 19 k = 0 c = d^(1/3) N(c) a = continued_fraction(c) print(convergents(a))
b = a.convergent(k) print(b)
a.convergent(2)
var(' a c d ') d = 7 c = d^(1/3) a = continued_fraction(c) convs = convergents(a) convs[:100].list()