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Search: id:A075433
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| A075433 |
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Perfect powers pp(n) with perfect power index n. |
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+0
1
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| 1, 9, 32, 36, 128, 324, 361, 529, 729, 1444, 2401, 3969, 6400, 9261, 10000, 10609, 13689, 19321, 26569, 32761, 35721, 42025, 47089, 61009, 77841, 87025, 97336, 120409, 147456, 177241, 199809, 214369, 255025, 302500, 357604, 417316, 485809
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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9 is OK because pp(4)=9 and 4 is itself pp.
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MATHEMATICA
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pp = Select[ Range[10^7], Apply[GCD, Last[ Transpose[ FactorInteger[ # ]]]] > 1 &]; pp[[ Take[pp, {1, 37}]]]
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CROSSREFS
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Sequence in context: A159279 A048547 A141573 this_sequence A018833 A130510 A120498
Adjacent sequences: A075430 A075431 A075432 this_sequence A075434 A075435 A075436
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KEYWORD
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easy,nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Oct 11 2002
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EXTENSIONS
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Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Oct 14 2002
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