First differences of Kempner numbers A002034.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =-2a(5) =4a(6) =-3a(7) =2a(8) =-1a(9) =6a(10) =-7a(11) =9a(12) =-6a(13) =-2a(14) =1a(15) =11a(16) =-11a(17) =13a(18) =-14a(19) =2a(20) =4a(21) =12a(22) =-19a(23) =6a(24) =3a(25) =-4a(26) =-2a(27) =22a(28) =-24a(29) =26