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A075433 Perfect powers pp(n) with perfect power index n. 0

%I

%S 1,9,32,36,128,324,361,529,729,1444,2401,3969,6400,9261,10000,10609,

%T 13689,19321,26569,32761,35721,42025,47089,61009,77841,87025,97336,

%U 120409,147456,177241,199809,214369,255025,302500,357604,417316,485809

%N Perfect powers pp(n) with perfect power index n.

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

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

%K easy,nonn

%O 1,2

%A _Zak Seidov_, Oct 11 2002

%E Edited and extended by _Robert G. Wilson v_, Oct 14 2002

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Last modified August 12 05:33 EDT 2020. Contains 336438 sequences. (Running on oeis4.)