405150domain: NAppears in sequencesa(n) = (4*n+1)*(4*n+2)*(4*n+3).at n=18A001505a(n) = 3*n*(3*n-1)*(3*n-2).at n=25A054776a(n) = lcm(3n+1, 3n+2, 3n+3).at n=24A061495Area of the unique primitive Pythagorean triple whose inradius is the n-th odd prime and whose short leg is an even number.at n=19A380302