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A119977 Triangular numbers that can be written as sum of three positive cubes. 5

%I #10 Aug 11 2014 22:45:28

%S 3,10,36,55,66,136,153,190,253,378,496,528,820,946,1035,1128,1485,

%T 3240,3403,3655,4950,5886,6903,7750,8128,8256,9316,10440,12403,13203,

%U 13861,14365,14535,15051,15753,16290,17020,17205,17578,18915

%N Triangular numbers that can be written as sum of three positive cubes.

%C Intersection of A003072 and A000217.

%H Donovan Johnson, <a href="/A119977/b119977.txt">Table of n, a(n) for n = 1..6577</a>

%H <a href="/index/Su#ssq">Index entries for sequences related to sums of cubes</a>

%e 153 = 17*(17+1)/2 = 5^3 + 3^3 + 1^3, therefore 153 is a term.

%Y Cf. A113958, A003108, A000578.

%K nonn

%O 1,1

%A _Reinhard Zumkeller_, Jun 03 2006

%E Two duplicated terms removed by _Donovan Johnson_, Apr 19 2011

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)