|
|
A172418
|
|
Numbers k that have measure of smoothness J larger than 3, where J = log(k)/log(rad(k)) and rad(k) is the product of the distinct prime divisors of k (A007947).
|
|
5
|
|
|
16, 32, 64, 81, 128, 243, 256, 288, 324, 384, 432, 486, 512, 576, 625, 648, 729, 768, 864, 972, 1024, 1152, 1250, 1280, 1296, 1458, 1536, 1600, 1728, 1944, 2000, 2048, 2187, 2304, 2401, 2500, 2560, 2592, 2916, 3072, 3125, 3136, 3200, 3456, 3584, 3645
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
MATHEMATICA
|
aa = {}; Do[kk = FactorInteger[c]; nn = 1; Do[nn = nn*kk[[n]][[1]], {n, 1, Length[kk]}]; If[Log[c]/Log[nn] > 3, AppendTo[aa, c]], {c, 2, 10000}]; aa
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|