153791domain: NAppears in sequencesa(n) = n^5 - n^2*(n^2 - 1)/2.at n=11A100242a(n) = n * (binomial(n + 1, 3) + 1).at n=31A329523a(n) is the smallest number with exactly n divisors such that all its divisors end with the same digit (which is necessarily 1).at n=11A338784