186876domain: NAppears in sequencesTriangle of generalized Stirling numbers S_{3,3}(n,k) read by rows (n>=1, 3<=k<=3n).at n=15A078741Fourth column (k=6) of array A078741 ((3,3)-Stirling2).at n=2A089519Numbers which form a prime by appending a 3-digit number and form no primes by appending 1 digit or 2 digits.at n=35A365813