161840domain: NAppears in sequencesa(n) = Sum_{k=1..n, gcd(n,k) = 1} k^3.at n=33A053819Spt function: total number of smallest parts (counted with multiplicity) in all partitions of n.at n=38A092269spt(5n+4) where spt(n) = A092269(n).at n=7A220485