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A339664
Number of nonempty subsets of divisors of n whose geometric mean is an integer.
3
1, 2, 2, 5, 2, 4, 2, 8, 5, 4, 2, 10, 2, 4, 4, 15, 2, 10, 2, 10, 4, 4, 2, 16, 5, 4, 8, 10, 2, 8, 2, 26, 4, 4, 4, 63, 2, 4, 4, 16, 2, 8, 2, 10, 10, 4, 2, 30, 5, 10, 4, 10, 2, 16, 4, 16, 4, 4, 2, 20, 2, 4, 10, 45, 4, 8, 2, 10, 4, 8, 2, 196, 2, 4, 10, 10, 4, 8, 2, 30
OFFSET
1,2
EXAMPLE
a(12) = 10 subsets: {1}, {2}, {3}, {4}, {6}, {12}, {1, 4}, {3, 12}, {1, 2, 4} and {3, 6, 12}.
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Dec 11 2020
STATUS
approved