311925domain: NAppears in sequencesNumber of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 6,5,2,2,0,1,2 for x=0,1,2,3,4,5,6.at n=6A197996Numbers n such that sigma(Rev(phi(n))) = phi(Rev(sigma(n))), where sigma is the sum of divisors and phi the Euler totient function.at n=34A252255