88604domain: NAppears in sequencesTrajectory of 1 under map n->13n+1 if n odd, n->n/2 if n even.at n=26A033964Number of nX4 0..1 arrays with every element equal to 1, 2, 4 or 7 king-move adjacent elements, with upper left element zero.at n=17A298089Numbers k such that k^2, (k+1)^2 and (k+2)^2 are all abundant numbers.at n=28A383391