A093221 a(n) is the largest number such that all of a(n)'s length-n substrings are distinct and divisible by 21.

0, 8421, 75672, 760273087, 7677679779737737, 99997899997, 777300377790097776006777, 7777778477777721777777, 77777752577777725277777752, 7777770021777777008477777700

Offset

1,2

Links

Table of n, a(n) for n=1..10.

Hans Havermann, Table of A093211-A093299

Example

a(2) is 8421 because its length-2 substrings (84, 42, 21) are all distinct and divisible by 21 and there is no larger number with this property

Crossrefs

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

Sequence in context: A214117 A237137 A208182 * A023321 A116258 A116311

Adjacent sequences: A093218 A093219 A093220 * A093222 A093223 A093224

Keyword

base,nonn

Author

Hans Havermann, Mar 28 2004

Status

approved