62321domain: NAppears in sequencesDenominators of continued fraction convergents to sqrt(399).at n=6A041759a(n) = n^3 - n^2 - 2*n + 1.at n=40A123972Numbers n such that n^1+n+1, n^2+n+1, n^3+n+1 and n^4+n+1 are all prime.at n=28A219117a(n) = 40*a(n - 1) - a(n - 2) for n>1, a(0) = 1, a(1) = 1.at n=4A269028