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A018787 Numbers that are the sum of two positive cubes in at least three ways (all solutions). 2
87539319, 119824488, 143604279, 175959000, 327763000, 700314552, 804360375, 958595904, 1148834232, 1407672000, 1840667192, 1915865217, 2363561613, 2622104000, 3080802816, 3235261176, 3499524728, 3623721192, 3877315533, 4750893000, 5544709352, 5602516416 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

J. Leech, Some solutions of Diophantine equations, Proc. Camb. Phil. Soc., 53 (1957), 778-780.

R. K. Guy, Unsolved Problems in Number Theory, D1.

LINKS

Ray Chandler, Table of n, a(n) for n=1..100000

Uwe Hollerbach, Taxi, Taxi! [Original link, broken]

Uwe Hollerbach, Taxi, Taxi! [Replacement link to Wayback Machine]

Uwe Hollerbach, Taxi! Taxi! [Cached copy from Wayback Machine, html version of top page only]

MATHEMATICA

a=Sort[Flatten@Table[n^3+m^3, {m, 2000}, {n, m-1, 1, -1}]]; f3[l_]:=Module[{t={}}, Do[If[l[[n]]==l[[n+2]], AppendTo[t, l[[n]]]], {n, 1, Length[l]-2}]; t]; f3[a] (* Vladimir Joseph Stephan Orlovsky, Jan 21 2012 *)

CROSSREFS

Cf. A003825 (primitive solutions).

Sequence in context: A115534 A138030 A104964 * A003825 A114259 A234981

Adjacent sequences:  A018784 A018785 A018786 * A018788 A018789 A018790

KEYWORD

nonn

AUTHOR

David W. Wilson Aug 15 1996.

STATUS

approved

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Last modified August 17 03:51 EDT 2017. Contains 290631 sequences.