Sum of numbers in range 10*n to 10*n+9.

Terms

a(0) =45a(1) =145a(2) =245a(3) =345a(4) =445a(5) =545a(6) =645a(7) =745a(8) =845a(9) =945a(10) =1045a(11) =1145a(12) =1245a(13) =1345a(14) =1445a(15) =1545a(16) =1645a(17) =1745a(18) =1845a(19) =1945a(20) =2045a(21) =2145a(22) =2245a(23) =2345a(24) =2445a(25) =2545a(26) =2645a(27) =2745a(28) =2845a(29) =2945