54794domain: NAppears in sequencesNumber of ordered triples (w,x,y) with all terms in {1,...,n} and w^2+x^2+y^2>=n.at n=38A211641Numbers whose sum of anti-divisors is equal to the sum of the divisors of their arithmetic derivative.at n=29A249912Total number of congruence subgroups of PSL(2,Z) of genus n.at n=17A258691