p := tri(231)
	p.Sub(p, intOne)
	p.Sub(p, intOne) // tri(231) - 2 is a prime == 5 mod 8
	x := new(Int).SetUint64(7)
	for i := 0; i < b.N; i++ {
		x.SetUint64(7)
		x.modSqrtTonelliShanks(x, p)
	}
}

func BenchmarkModSqrt231_5Mod8(b *testing.B) {
	p := tri(231)
	p.Sub(p, intOne)
	p.Sub(p, intOne) // tri(231) - 2 is a prime == 5 mod 8
	x := new(Int).SetUint64(7)