2299836domain: NAppears in sequencesa(n) = (5*n + 1)*(5*n + 2)*(5*n + 3).at n=26A001509a(n) = (4*n-1)*4*n*(4*n+1).at n=33A069140Area of the unique primitive Pythagorean triple whose inradius is the n-th odd prime and whose short leg is an even number.at n=30A380302