`n_gcdinv`

Synopsis#include <flint/ulong_extras.h>

ulong n_gcdinv(ulong * a, ulong x, ulong y)source

Returns $g = \gcd(x, y)$ and sets *a to the $0 \le a < y$ with $ax \equiv g \pmod y$ . Requires $x < y$ . When $y = 1$ , returns 1 and sets *a to 0.

Cite this page

The FLINT team, “n_gcdinv (ulong_extras.h),” FLINT: Fast Library for Number Theory, documentation, version 3.7.0-dev, 2026. https://flintlib.org/doc/ulong_extras/n_gcdinv.html (generated 2026-11-02).

@misc{flint-doc-ulong-extras-n-gcdinv,
  author       = {{The FLINT team}},
  title        = {{n\_gcdinv (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_gcdinv.html},
  note         = {Generated 2026-11-02}
}

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