A093218 a(n) is the largest number such that all of a(n)'s length-n substrings are distinct and divisible by 18.

0, 900, 99000, 8892880288, 9889208802088, 9988920088020088, 9998892000880200088, 9999889200008802000088, 9999988920000088020000088, 9999998892000000880200000088, 9999999889200000008802000000088, 9999999988920000000088020000000088

Offset

1,2

Comments

For n > 3, is a(n) of the form [(n-4) 9's]8892[(n-4) 0's]8802[(n-4) 0's]88? - David A. Corneth, Oct 25 2017

Links

Table of n, a(n) for n=1..12.

John Cerkan, Python 2.7

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 18 and there is no larger number with this property.

Crossrefs

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

Sequence in context: A374245 A093230 A093798 * A093215 A252674 A158407

Adjacent sequences: A093215 A093216 A093217 * A093219 A093220 A093221

Keyword

base,nonn

Author

Hans Havermann, Mar 28 2004

Extensions

a(12) from John Cerkan, Oct 25 2017

Status

approved