116836domain: NAppears in sequencesNumbers k such that phi(k)*sigma(k) is a triangular number.at n=14A115911Number of (n+2)X(6+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=10A253839