85563208domain: NAppears in sequencesNumbers k where tan(k) decreases monotonically to 0 (or cot(k) increases).at n=13A046956Cos(a(n)) decreases monotonically to -1.at n=11A046965Numerators of the other-side convergents to Pi.at n=12A259591Integers in the interval [Pi*k - 1/k, Pi*k + 1/k] for some k > 0.at n=39A265735