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A075433 Perfect powers pp(n) with perfect power index n. 0
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; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..37.

EXAMPLE

9 is OK because pp(4)=9 and 4 is itself pp.

MATHEMATICA

pp = Select[ Range[10^7], Apply[GCD, Last[ Transpose[ FactorInteger[ # ]]]] > 1 &]; pp[[ Take[pp, {1, 37}]]]

CROSSREFS

Sequence in context: A159279 A048547 A141573 * A018833 A130510 A120498

Adjacent sequences:  A075430 A075431 A075432 * A075434 A075435 A075436

KEYWORD

easy,nonn

AUTHOR

Zak Seidov, Oct 11 2002

EXTENSIONS

Edited and extended by Robert G. Wilson v, Oct 14 2002

STATUS

approved

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Last modified July 5 01:22 EDT 2020. Contains 335457 sequences. (Running on oeis4.)