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A054224 A054221 without cubes. 1
7, 10, 23, 48, 199, 621, 978, 1222, 3563, 4034, 4331, 5017, 6442, 6886, 7783, 8699, 11157, 12287, 12386, 30258, 30525, 31629, 35461, 49250, 52737, 55404, 64356, 65191, 72178, 119109, 120806, 126941 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
MATHEMATICA
max = 20000; s = {}; Do[ k = ((i*(i+1)*(i+2) - j*(j+1)*(j+2))/6)^(1/3); If[IntegerQ[k] && !IntegerQ[i^(1/3)], Print[i]; AppendTo[s, i]], {j, 1, max}, {i, j+1, max}]; Sort[s] (* Jean-François Alcover, Dec 20 2012 *)
CROSSREFS
Cf. A054221.
Sequence in context: A120312 A074377 A103119 * A183330 A196316 A134329
KEYWORD
nice,nonn
AUTHOR
Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Feb 04 2000
EXTENSIONS
Extended to 19 terms by Jean-François Alcover, Dec 20 2012
More terms from Joerg Arndt, Apr 06 2013
STATUS
approved

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Last modified May 21 13:19 EDT 2024. Contains 372736 sequences. (Running on oeis4.)