Constant curve25519_dalek::constants::SQRT_M1

pub const SQRT_M1: FieldElement = FieldElement([-32595792, -7943725, 9377950, 3500415, 12389472, -272473,
              -25146209, -2005654, 326686, 11406482])

Precomputed value of one of the square roots of -1 (mod p)