Numerator of sigma_3(n)/sigma(n).

Terms

a(0) =1a(1) =3a(2) =7a(3) =73a(4) =21a(5) =21a(6) =43a(7) =39a(8) =757a(9) =63a(10) =111a(11) =73a(12) =157a(13) =129a(14) =147a(15) =151a(16) =273a(17) =2271a(18) =343a(19) =219a(20) =301a(21) =333a(22) =507a(23) =273a(24) =15751a(25) =471a(26) =511a(27) =3139a(28) =813a(29) =441