A093281 a(n) is the largest number such that all of a(n)'s length-n substrings are distinct and divisible by 81.

0, 81, 9729, 996399, 99954999, 99630099630, 999993699999, 99999927999999, 99999991899999991, 9999999990999999999, 999999999009999999990, 99999999900099999999900, 9999999990000999999999000, 999999999000009999999990000, 99999999999630099999999999630

Offset

1,2

Links

Table of n, a(n) for n=1..15.

Hans Havermann, Table of A093211-A093299

Example

a(4) is 996399 because its length-4 substrings (9963, 9639, 6399) are all distinct and divisible by 81 and there is no larger number with this property.

Crossrefs

Cf. A093211, A093212, ..., A093299.

Sequence in context: A184337 A034993 A223328 * A059988 A017020 A237027

Adjacent sequences: A093278 A093279 A093280 * A093282 A093283 A093284

Keyword

base,nonn

Author

Hans Havermann, Mar 29 2004

Extensions

a(11)-a(15) from John Cerkan, Jan 05 2018

Status

approved