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 A172422 Numbers k that have measure of smoothness J larger than 7, where J = log(k)/log(rad(k)) and rad(k) is the product of the distinct prime divisors of k (A007947). 5
 256, 512, 1024, 2048, 4096, 6561, 8192, 16384, 19683, 32768, 59049, 65536, 131072, 177147, 262144, 294912, 314928, 331776, 354294, 373248, 390625, 393216, 419904, 442368, 472392, 497664, 524288, 531441, 559872, 589824, 629856, 663552, 708588, 746496, 786432 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS This sequence is a subsequence of A049094, A172418, A172419, A172420, and A172421. LINKS Amiram Eldar, Table of n, a(n) for n = 1..500 MATHEMATICA aa = {}; Do[kk = FactorInteger[c]; nn = 1; Do[nn = nn*kk[[n]][[1]], {n, 1, Length[kk]}]; If[Log[c]/Log[nn] > 7, AppendTo[aa, c]], {c, 2, 10000}]; aa CROSSREFS Cf. A007947, A049094, A059172, A172418, A172419, A172420, A172421. Sequence in context: A309092 A043336 A256822 * A341887 A031465 A045081 Adjacent sequences: A172419 A172420 A172421 * A172423 A172424 A172425 KEYWORD nonn AUTHOR Artur Jasinski, Feb 02 2010 EXTENSIONS More terms from Amiram Eldar, Mar 10 2020 STATUS approved

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Last modified July 21 02:16 EDT 2024. Contains 374462 sequences. (Running on oeis4.)