Carmichael's Lambda Function



Is Carmichael's Lambda Function implemented?

Sloane's A002322 Reduced totient function psi(n): least k such that x^k
== 1 (mod n) for all x prime to n; also Carmichael lambda function
(exponent of unit group mod n). 

http://mathworld.wolfram.com/CarmichaelFunction.html

tomdean