181299domain: NAppears in sequencesNumbers k > 0 such that (10^(k+2) + 666)*10^k + 1 is prime.at n=8A156166Number of (n+3)X(2+3) 0..1 arrays with each row and column divisible by 15, read as a binary number with top and left being the most significant bits.at n=12A262451