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 A125496 Deficient cubes. 1
 1, 8, 27, 64, 125, 343, 512, 729, 1331, 2197, 3375, 4096, 4913, 6859, 9261, 12167, 15625, 19683, 24389, 29791, 32768, 35937, 39304, 42875, 50653, 54872, 59319, 68921, 79507, 91125, 97336, 103823, 117649, 132651, 148877, 166375, 185193 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 MAPLE with(numtheory): a:=proc(n) if sigma(n^3)<2*n^3 then n^3 else fi end: seq(a(n), n=1..70); # Emeric Deutsch, Jan 10 2007 isA005100 := proc(n) if numtheory[sigma](n) < 2*n then RETURN(true) ; else RETURN(false) ; fi ; end : for n from 1 to 100 do if isA005100(n^3) then printf("%d, ", n^3) ; fi ; od ; # R. J. Mathar, Jan 12 2007 MATHEMATICA Select[Range[60]^3, DivisorSigma[1, #]<2#&] (* Harvey P. Dale, Feb 15 2014 *) CROSSREFS Intersection of A005100 (deficient numbers) and A000578 (cubes). Sequence in context: A052048 A052064 A352049 * A030289 A111131 A111103 Adjacent sequences: A125493 A125494 A125495 * A125497 A125498 A125499 KEYWORD nonn AUTHOR Tanya Khovanova, Dec 27 2006 EXTENSIONS More terms from Emeric Deutsch, Jan 10 2007 More terms from R. J. Mathar, Jan 12 2007 STATUS approved

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Last modified July 23 17:49 EDT 2024. Contains 374553 sequences. (Running on oeis4.)