1,2

Table of n, a(n) for n=1..58.

n=9 -> 9{10}=10{9}=11{8}=12{7}=13{6}=14{5}=21{4}=100{3}=1001{2} -> 91011121314211001001 which is divisible by 21 (from 9 in base 4).

Cf. A054220.

Sequence in context: A217349 A329574 A087278 * A337801 A116214 A161389

Adjacent sequences: A054216 A054217 A054218 * A054220 A054221 A054222

nonn,base

Patrick De Geest, Feb 15 2000

approved