48203domain: NAppears in sequencesRuth-Aaron numbers (1): sum of prime divisors of n = sum of prime divisors of n+1.at n=31A006145Numbers k such that sopfr(k) = sopf(k+1), where sopf(k) = A008472(k) and sopfr(k) = A001414(k).at n=28A064675a(n) = prime(n)^3 mod (n^2 + prime(n)^2).at n=48A243769