166011domain: NAppears in sequencesa(n) = t(1) - t(2) + t(3) + ... + c*t(n), where c = (-1)^(n+1) and t(j) are Stirling numbers S(n,k) in decreasing order, for k = 1,2,...,n.at n=11A024432Number of primes of the form 12k + 1 less than 10^n.at n=6A091161