A093270 a(n) is the largest number such that all of a(n)'s length-n substrings are distinct and divisible by 70.

0, 700, 77000, 7770000, 777700000, 77777000000, 7777770000000, 777777700000000, 77777777000000000, 7777777770000000000, 777777777700000000000, 77777777777000000000000, 7777777777770000000000000, 777777777777700000000000000, 77777777777777000000000000000

Offset

1,2

Links

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

Hans Havermann, Table of A093211-A093299

Example

a(3) is 77000 because its length-3 substrings (770, 700, 000) are all distinct and divisible by 70 and there is no larger number with this property.

Crossrefs

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

Sequence in context: A293279 A250530 A200169 * A093235 A223351 A180469

Adjacent sequences: A093267 A093268 A093269 * A093271 A093272 A093273

Keyword

base,nonn

Author

Hans Havermann, Mar 29 2004

Extensions

a(9)-a(15) from John Cerkan, Jan 08 2018

Status

approved