4798248domain: NAppears in sequencesa(n) = n^6 - n^4.at n=13A136038a(n) = prime(n)^6 - prime(n)^4.at n=5A138411a(n) = Pell(n)^3 - Pell(n)^2, where Pell(n) is the n-th Pell number (A000129).at n=7A244352The second Jordan totient function applied to the cubefull numbers: a(n) = A007434(A036966(n)).at n=28A379718