684450domain: NAppears in sequencesNumbers k such that Sum_{d divides k} sigma(d)/phi(d) is an integer.at n=42A068991Number of bases to which terms of A141768 are strong pseudoprimes.at n=36A195328Integer quotients of k^2 by the sum of the prime distinct divisors of k^2+1, where k = A196219(n).at n=26A196220