924128domain: NAppears in sequencesa(n) = Sum_{k=1..n} k*binomial(n, k)^3*(n^2 + n - k*n - k + k^2)/((n - k + 1)^2*n).at n=7A201640Numbers n such that n and n + 1 are both of the form p*q^5 where p and q are distinct primes.at n=12A215198