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A339994 Sums of two distinct nonzero even cubes. 0

%I #10 Jun 06 2021 05:25:48

%S 72,224,280,520,576,728,1008,1064,1216,1512,1736,1792,1944,2240,2728,

%T 2752,2808,2960,3256,3744,4104,4160,4312,4472,4608,5096,5824,5840,

%U 5896,6048,6344,6832,6840,7560,8008,8064,8216,8512,8576,9000,9728,9928,10656,10712,10744

%N Sums of two distinct nonzero even cubes.

%F a(n) = 8 * A024670(n). - _Rémy Sigrist_, Jun 06 2021

%e 224 is in the sequence since 2^3 + 6^3 = 8 + 216 = 224, where 8 and 216 are even cubes such 0 < 8 < 216.

%t Table[If[Sum[Mod[i + 1, 2] Mod[n - i + 1, 2] (Floor[i^(1/3)] - Floor[(i - 1)^(1/3)]) (Floor[(n - i)^(1/3)] - Floor[(n - i - 1)^(1/3)]), {i, Floor[(n - 1)/2]}] > 0, n, {}], {n, 1200}] // Flatten

%Y Cf. A000578, A010057, A024670, A339990.

%K nonn

%O 1,1

%A _Wesley Ivan Hurt_, Dec 25 2020

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Last modified April 25 12:33 EDT 2024. Contains 371969 sequences. (Running on oeis4.)