Least k such that prime(k) >= k*tau(k*n) where tau = A000005.

Terms

a(0) =1a(1) =1a(2) =1a(3) =181a(4) =1a(5) =1061a(6) =1a(7) =1061a(8) =181a(9) =1061a(10) =1a(11) =40123a(12) =1a(13) =1061a(14) =1061a(15) =6473a(16) =1a(17) =40123a(18) =1a(19) =40123a(20) =1061a(21) =1061a(22) =1a(23) =1617211a(24) =181a(25) =1061a(26) =1061a(27) =40123a(28) =1a(29) =1617211