

A025400


Numbers that are the sum of 3 distinct positive cubes in exactly 2 ways.


4



1009, 1366, 1457, 1520, 1737, 1756, 1793, 1854, 1945, 2072, 2241, 2456, 2736, 3060, 3592, 3599, 3745, 3926, 4105, 4131, 4168, 4229, 4320, 4376, 4437, 4447, 4473, 4616, 4733, 4922, 5130, 5435, 5472, 5643, 5706, 5825, 5832, 6183, 6301, 6642, 6848, 6904
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


LINKS

Table of n, a(n) for n=1..42.


MATHEMATICA

Reap[ For[n = 1, n <= 7000, n++, pr = Select[ PowersRepresentations[n, 3, 3], Times @@ # != 0 && Length[#] == Length[Union[#]] &] ; If[pr != {} && Length[pr] == 2, Print[n, pr]; Sow[n]]]][[2, 1]] (* JeanFrançois Alcover, Jul 31 2013 *)


CROSSREFS

Sequence in context: A153640 A139665 A024974 * A182695 A100776 A126238
Adjacent sequences: A025397 A025398 A025399 * A025401 A025402 A025403


KEYWORD

nonn


AUTHOR

David W. Wilson


STATUS

approved



