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A139308 Lucky numbers that are pure powers with power greater than 2. 0

%I

%S 729,2187,29791,50625,50653,83521,130321,132651,166375,185193,226981,

%T 300763,707281,804357,823543,1295029,1860867,1874161,2685619,3176523,

%U 4782969,5545233,5764801,7189057,9393931,12977875,13845841,16194277

%N Lucky numbers that are pure powers with power greater than 2.

%e a(1) = 729 = 3^6 and 729 is lucky, i.e., A000959(118) = 729.

%t t = 2 Range@ 10000000 - 1; f[n_] := Block[{k = t[[n]]}, t = Delete[t, Table[{k}, {k, k, Length@t, k}]]]; Do[f@n, {n, 2, 1000000}]; fQ[n_] := ! IntegerQ@ Log[2, n] && GCD @@ Last /@ FactorInteger@n > 2; Select[t, fQ] (* _Robert G. Wilson v_, Oct 16 2010 *)

%Y Cf. A000959, A031162.

%K nonn

%O 1,1

%A _Walter Kehowski_, Jun 07 2008

%E a(16)-a(29) from _Robert G. Wilson v_, Oct 16 2010

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Last modified January 20 04:21 EST 2019. Contains 319323 sequences. (Running on oeis4.)