151311domain: NAppears in sequencesNumber of consecutive runs of just 1 odd nonprime congruent to 1 mod 4 below 10^n.at n=5A093183Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010011.at n=9A260764