On a problem of Cusick concerning the sum of digits of n and n+t

M. Drmota, M. Kauers, L. Spiegelhofer

• deq.txt -- guessed differential equation for the diagonal of F(x,y,z) in Section 4.3
• rec.txt -- guessed recurrence equation for the diagonal of F(x,y,z) in Section 4.3
• taylor.sws -- Sage worksheet about the Taylor expansion in Section 4.3
• P.m -- telescoper for U(x,y) in Section 5.2
• Q.m -- certificate for U(x,y) in Section 5.2