Sum of all numbers from tau(n) to sigma(n).

Terms

a(0) =1a(1) =5a(2) =9a(3) =25a(4) =20a(5) =72a(6) =35a(7) =114a(8) =88a(9) =165a(10) =77a(11) =391a(12) =104a(13) =294a(14) =294a(15) =486a(16) =170a(17) =765a(18) =209a(19) =888a(20) =522a(21) =660a(22) =299a(23) =1802a(24) =493a(25) =897a(26) =814a(27) =1581a(28) =464a(29) =2600