670124014560domain: NAppears in sequencesLeast k > 0 such that t^k = 1 mod (prime(n) - t) for 0 < t < prime(n).at n=27A066220Period of reciprocal of the primorials.at n=25A092281a(n) is the multiplicative order of the n-th prime number q modulo (q-1)#.at n=27A333992