35644128domain: NAppears in sequencesNonprimes k such that sopfr(k) = rad(k), where sopfr(k) is sum of the prime factors of k (counting multiplicity), and rad(k) is the product of its distinct prime factors.at n=30A386916a(n) is the smallest composite k such that radical(k) = sopfr(k) = A350352(n).at n=4A391316