pub const MERSENNE_61_PRIME: u64 = _; // 2_305_843_009_213_693_951u64Expand description
M61 prime (2^61−1); used as $q_0$ in TestUairFqLargePrime.
pub const MERSENNE_61_PRIME: u64 = _; // 2_305_843_009_213_693_951u64M61 prime (2^61−1); used as $q_0$ in TestUairFqLargePrime.