205291domain: NAppears in sequencesCoefficient of x in the reduction by x^2->x+1 of the polynomial p(n,x) defined at Comments.at n=21A193045Number of primes of the form (x+1)^7 - x^7 less than 10^n.at n=39A221977Numbers that begin a run of an odd number of consecutive integers whose cubes sum to a square.at n=28A253679