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A093227
a(n) is the largest number such that all of a(n)'s length-n substrings are distinct and divisible by 27.
0
0, 81, 97297, 9990999, 999009990, 99997299997, 9999990999999, 999999009999990
OFFSET
1,2
EXAMPLE
a(3) is 97297 because its length-3 substrings (972, 729, 297) are all distinct and divisible by 27 and there is no larger number with this property
CROSSREFS
Cf. A093211, A093212, ..., A093299.
Sequence in context: A128493 A145261 A013745 * A187751 A285997 A143675
KEYWORD
base,nonn
AUTHOR
Hans Havermann, Mar 28 2004
STATUS
approved