This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A139308 Lucky numbers that are pure powers with power greater than 2. 0
 729, 2187, 29791, 50625, 50653, 83521, 130321, 132651, 166375, 185193, 226981, 300763, 707281, 804357, 823543, 1295029, 1860867, 1874161, 2685619, 3176523, 4782969, 5545233, 5764801, 7189057, 9393931, 12977875, 13845841, 16194277 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE a(1) = 729 = 3^6 and 729 is lucky, i.e., A000959(118) = 729. MATHEMATICA 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 *) CROSSREFS Cf. A000959, A031162. Sequence in context: A232925 A255112 A255627 * A295024 A167728 A050220 Adjacent sequences:  A139305 A139306 A139307 * A139309 A139310 A139311 KEYWORD nonn AUTHOR Walter Kehowski, Jun 07 2008 EXTENSIONS a(16)-a(29) from Robert G. Wilson v, Oct 16 2010 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 17 06:08 EDT 2019. Contains 328106 sequences. (Running on oeis4.)