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A282164
a(n) is the minimal product of a positive integer sequence of length n with no duplicate substrings of length greater than 1.
5
1, 1, 2, 2, 4, 6, 12, 24, 48, 120, 240, 720, 1440, 4320, 8640, 25920, 60480, 181440, 483840, 1451520, 3870720, 11612160, 34836480, 104509440, 348364800, 1045094400, 3483648000, 10450944000, 38320128000, 114960384000, 459841536000, 1379524608000, 5518098432000, 16554295296000
OFFSET
1,3
COMMENTS
a(n) = sqrt(A282165(n-1)) if A282165(n-1) is square.
LINKS
EXAMPLE
a(1) = 1 via [1];
a(2) = 1 via [1,1];
a(3) = 2 via [1,1,2];
a(4) = 2 via [1,1,2,1];
a(5) = 4 via [1,1,2,2,1];
a(6) = 6 via [1,1,2,1,3,1];
a(7) = 12 via [1,1,2,2,1,3,1];
a(8) = 24 via [1,1,2,1,3,1,4,1];
a(9) = 48 via [1,1,2,2,1,3,1,4,1];
a(10) = 120 via [1,1,2,1,3,1,4,1,5,1].
CROSSREFS
Product analog of A259280.
Sequence in context: A128209 A274935 A188538 * A268175 A363578 A209025
KEYWORD
nonn
AUTHOR
STATUS
approved