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 A177493 Products of cubes of 2 or more distinct primes. 1
 216, 1000, 2744, 3375, 9261, 10648, 17576, 27000, 35937, 39304, 42875, 54872, 59319, 74088, 97336, 132651, 166375, 185193, 195112, 238328, 274625, 287496, 328509, 343000, 405224, 456533, 474552, 551368, 614125, 636056, 658503, 753571, 804357, 830584, 857375 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Andrew Howroyd, Table of n, a(n) for n = 1..1000 FORMULA a(n) = A120944(n)^3. - R. J. Mathar, Dec 06 2010 EXAMPLE 216 = 2^3 * 3^3. 9261 = 3^3 * 7^3. 27000 = 2^3 * 3^3 * 5^3. MATHEMATICA f1[n_]:=Length[Last/@FactorInteger[n]]; f2[n_]:=Union[Last/@FactorInteger[n]]; lst={}; Do[If[f1[n]>1&&f2[n]=={3}, AppendTo[lst, n]], {n, 0, 9!}]; lst Reap[Do[{p, e}=Transpose[FactorInteger[n]]; If[Length[p]>1 && Union[e]=={3}, Sow[n]], {n, 343000}]][[2, 1]] PROG (PARI) [k^3 | k<-[1..100], k>1 && !isprime(k) && issquarefree(k)] \\ Andrew Howroyd, Jan 14 2020 CROSSREFS Cf. A000469, A085986, A162142, A177492. Sequence in context: A109399 A111029 A124581 * A162142 A233859 A233853 Adjacent sequences: A177490 A177491 A177492 * A177494 A177495 A177496 KEYWORD nonn AUTHOR Vladimir Joseph Stephan Orlovsky, May 10 2010 EXTENSIONS Definition corrected by R. J. Mathar, Dec 06 2010 Terms a(25) and beyond from Andrew Howroyd, Jan 14 2020 STATUS approved

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Last modified June 7 00:08 EDT 2023. Contains 363151 sequences. (Running on oeis4.)