Function invmod
Calculate the (modular) multiplicative inverse of a modulo b. Solution to the equation ax ≣ 1 (mod b)
See https://en.wikipedia.org/wiki/Modular_multiplicative_inverse.
Syntax
math.invmod(a, b)
Parameters
| Parameter |
Type |
Description |
a |
number | BigNumber |
An integer number |
b |
number | BigNumber |
An integer number |
Returns
| Type |
Description |
| number | BigNumber |
Returns an integer number where invmod(a,b)*a ≣ 1 (mod b) |
Throws
Examples
math.invmod(8, 12) // returns NaN
math.invmod(7, 13) // return 2
math.invmod(15151, 15122) // returns 10429
See also
gcd,
xgcd
