Stewart, C. L. On the representation of an integer in two different bases. (English) Zbl 0426.10008 J. Reine Angew. Math. 319, 63-72 (1980). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 2 ReviewsCited in 34 Documents MSC: 11A63 Radix representation; digital problems 11A25 Arithmetic functions; related numbers; inversion formulas Keywords:representation of an integer; two different bases; number of digits; canonical expansion PDF BibTeX XML Cite \textit{C. L. Stewart}, J. Reine Angew. Math. 319, 63--72 (1980; Zbl 0426.10008) Full Text: DOI Crelle EuDML OpenURL Online Encyclopedia of Integer Sequences: Sum of digits of 2^n. a(n) = number of k such that sum of digits of 9^k is 9n. Sum of digits of 9^n.