48671domain: NAppears in sequences(Product of twin primes - 1)/2.at n=19A120876Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+409)^2 = y^2.at n=9A129641a(n) = 32*n^2 - 1.at n=38A158563a(n) = 72*n^2 - 1.at n=25A158738Growth series for affine Coxeter group B_4.at n=43A267167