https://numerics.net/documentation/latest/reference/numerics.net.biginteger.sqrt
BigInteger.Sqrt Method in C# - Numerics.NET
in cbigintegersqrtmethodnumerics
https://www.1ju.org/math/biginteger-longvalue
Java.math.BigInteger.longValue()方法實例 - Java.math包
java.math.BigInteger.longValue() 將此BigInteger轉換爲long。這種轉換是類似於從一個較長縮小原語轉換爲int。 如果此BigInteger是太大，不適合太長的，只有低64位被返回。此轉換會丟失關於BigInt
javamathbiginteger
https://numerics.net/documentation/latest/reference/numerics.net.biginteger.zero
BigInteger.Zero Field in C# - Numerics.NET
in cbigintegerzerofieldnumerics