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Search: id:A090896
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| A090896 |
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a(n) = sigma^n(n), where sigma^n denotes functional iteration. |
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+0
3
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| 1, 4, 8, 24, 120, 1170, 1512, 15748, 15748, 61440, 196584, 1572840, 1098240, 15605760, 50328576, 7074432, 355532800, 2143289344, 13815410400, 224319234048, 33541980160, 109760857440, 1468475386560, 33151875434496
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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a(8) = a(9). Are there any other numbers m, n such that a(m) = a(n)? a(16) < a(15); a(25) < a(24). How often is a(n+1) < a(n)?
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EXAMPLE
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a(3) = sigma^3(3) = sigma^2(4) = sigma(7) = 8
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CROSSREFS
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Sequence in context: A045881 A052578 A066631 this_sequence A131637 A068367 A000964
Adjacent sequences: A090893 A090894 A090895 this_sequence A090897 A090898 A090899
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KEYWORD
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nonn
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AUTHOR
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Gabriel Cunningham (gcasey(AT)mit.edu), Feb 25 2004
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