0,2

Simmons, G. J. The structure of the differentiation digraphs of binary sequences. Ars Combin. 35 (1993), A, 71-88. Math. Rev. 95f:05052.

Table of n, a(n) for n=0..75.

If n=b_k b_{k-1} ... b_0 in base 3, a(n) is number with ternary expansion (b_k+b_{k-1}) (b_{k-1}+b_{k-2}) ... (b_1+b_0) (b_0+b_{k}).

14=112->200 so a(14)=18.

Cf. A038554-A038556.

Sequence in context: A294501 A146004 A001933 * A011234 A208917 A161381

Adjacent sequences: A038554 A038555 A038556 * A038558 A038559 A038560

nonn,nice,easy

N. J. A. Sloane

Corrected and extended by Naohiro Nomoto, Apr 08 2001

approved