316713domain: NAppears in sequencesNumbers k such that there are 12 digits in k^2 and for each factor f of 12 (1,2,3,4,6) the sum of digit groupings of size f is a square.at n=0A153749Number of different nonnegative solutions of equation: x^2 - y^2 = k! for 1 <= k <= n.at n=23A181893