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

Terms

a(0) =1a(1) =5a(2) =7a(3) =22a(4) =11a(5) =63a(6) =15a(7) =92a(8) =55a(9) =126a(10) =23a(11) =340a(12) =27a(13) =209a(14) =195a(15) =376a(16) =35a(17) =627a(18) =39a(19) =713a(20) =318a(21) =435a(22) =47a(23) =1554a(24) =196a(25) =578a(26) =469a(27) =1218a(28) =59a(29) =2193