`n_factor_ecm_select_curve`

Synopsis#include <flint/ulong_extras.h>

int n_factor_ecm_select_curve(ulong * f, ulong sigma, ulong n, n_ecm_t n_ecm_inf)source

Selects a curve and starting point from sigma with Suyama's parametrisation, storing x_0, z_0 and (a + 2)/4 in n_ecm_inf. Returns 1 if a factor of n turned up along the way (stored in *f), otherwise 0.

Cite this page

The FLINT team, “n_factor_ecm_select_curve (ulong_extras.h),” FLINT: Fast Library for Number Theory, documentation, version 3.7.0-dev, 2026. https://flintlib.org/doc/ulong_extras/n_factor_ecm_select_curve.html (generated 2026-10-20).

@misc{flint-doc-ulong-extras-n-factor-ecm-select-curve,
  author       = {{The FLINT team}},
  title        = {{n\_factor\_ecm\_select\_curve (ulong\_extras.h)}},
  howpublished = {FLINT: Fast Library for Number Theory, documentation, version 3.7.0-dev},
  year         = {2026},
  url          = {https://flintlib.org/doc/ulong_extras/n_factor_ecm_select_curve.html},
  note         = {Generated 2026-10-20}
}

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