A093230 a(n) is the largest number such that all of a(n)'s length-n substrings are distinct and divisible by 30.

0, 900, 99000, 9990000, 999900000, 99999000000, 9999990000000, 999999900000000, 99999999000000000, 9999999990000000000, 999999999900000000000, 99999999999000000000000, 9999999999990000000000000, 999999999999900000000000000, 99999999999999000000000000000

Offset

1,2

Links

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

Hans Havermann, Table of A093211-A093299

Example

a(3) is 99000 because its length-3 substrings (990, 900, 000) are all distinct and divisible by 30 and there is no larger number with this property.

Crossrefs

Cf. A093211, A093212, ..., A093299, A093798.

Sequence in context: A356694 A359383 A374245 * A093798 A093218 A093215

Adjacent sequences: A093227 A093228 A093229 * A093231 A093232 A093233

Keyword

base,nonn

Author

Hans Havermann, Mar 28 2004

Extensions

a(11)-a(15) from John Cerkan, Jan 09 2018

Status

approved