NeinMath is playing around with arbitrary precision integers, written in pure managed code, not using any unsafe stuff, and a bit faster than the build-in .NET type for integers with a few thousand bits.
An arbitrary-precision Decimal type for C#. Port of decimal.js.
Extension methods for .NET BigInteger class
Big in C#. Port of big.js. A small, fast C# library for arbitrary-precision decimal arithmetic.
BigFraction implementation using .NET BigInteger class.
C# port of break_infinity.js, but for slightly bigger numbers (up to about 1e1e308).
FCTRL - Factorial Csharp&Pyhton
A library to handle arbitarly large numbers efficiently
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