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A093268
a(n) is the largest number such that all of a(n)'s length-n substrings are distinct and divisible by 68.
0
0, 68, 3408, 10204080, 77792888, 888080444040, 55505008880800, 9990900088808000, 666663636888884848, 222220022044444004408888800880, 7777700770044444004400, 999999999936, 55555505555004444440444400, 9999999999190044444444448400, 666666666606660444444444404440
OFFSET
1,2
EXAMPLE
a(4) is 10204080 because its length-4 substrings (1020, 0204, 2040, 0408, 4080) are all distinct and divisible by 68 and there is no larger number with this property.
CROSSREFS
Cf. A093211, A093212, ..., A093299.
Sequence in context: A017731 A204298 A281556 * A231250 A159361 A004298
KEYWORD
base,nonn
AUTHOR
Hans Havermann, Mar 29 2004
EXTENSIONS
a(11)-a(15) from John Cerkan, Jan 08 2018
STATUS
approved