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Search: id:A053023
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| A053023 |
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Divisor function applied thrice to n!. |
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+0
1
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| 1, 2, 2, 3, 2, 4, 6, 6, 6, 5, 8, 8, 8, 8, 8, 9, 8, 10, 8, 10, 10, 12, 10, 10, 10, 15, 16, 16, 18, 16, 8, 16, 10, 12, 16, 18, 14, 3, 14, 16, 24, 16, 16, 20, 24, 24, 28, 24, 24, 16, 24, 24, 32, 32, 28, 32, 18, 20, 24, 28, 36, 32, 36, 24, 21, 24, 20, 40, 40, 30, 30, 36, 40, 42, 24, 32
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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d[ d[ d[ n! ] ] ] = A036450(A000142(n)) = A036450(n!)
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EXAMPLE
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A036450[x]=8 if x = 11!, 12!, 13!, 14!, 15!. The reversed sequences of these d-iterates are {2, 3, 4, 8, 24, 540, 39916800}, {2, 3, 4, 8, 24, 792, 479001600}, {2, 3, 4, 8, 30, 1584, 6227020800}, {2, 3, 4, 8, 30, 2592, 87178291200}, {2, 3, 4, 8, 42, 4032, 1307674368000}.
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CROSSREFS
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Cf. A000005, A027473, A010553, A036450, A000142.
Sequence in context: A117660 A033822 A097004 this_sequence A102247 A054249 A033099
Adjacent sequences: A053020 A053021 A053022 this_sequence A053024 A053025 A053026
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Feb 24 2000
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