Partial sums of Kempner numbers A002034.

Terms

a(0) =1a(1) =3a(2) =6a(3) =10a(4) =15a(5) =18a(6) =25a(7) =29a(8) =35a(9) =40a(10) =51a(11) =55a(12) =68a(13) =75a(14) =80a(15) =86a(16) =103a(17) =109a(18) =128a(19) =133a(20) =140a(21) =151a(22) =174a(23) =178a(24) =188a(25) =201a(26) =210a(27) =217a(28) =246a(29) =251