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A093221 a(n) is the largest number such that all of a(n)'s length-n substrings are distinct and divisible by 21. 0
0, 8421, 75672, 760273087, 7677679779737737, 99997899997, 777300377790097776006777, 7777778477777721777777, 77777752577777725277777752, 7777770021777777008477777700 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 4 08:55 EDT 2022. Contains 357239 sequences. (Running on oeis4.)