26805949036domain: NAppears in sequencesNumbers k such that (Pi/2)*k^2*sin(1/k) < floor(Pi*k/2).at n=4A053431Greedy frac multiples of Pi: a(1)=1, Sum_{n>=1} frac(a(n)*Pi) = 1.at n=19A079938Denominators of approximations j/k for Pi such that abs(j/k - Pi)*sqrt(5)*k^2 < 1.at n=27A346534