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A055393 Sum of a square and a nonnegative cube in more than one way. 4

%I #9 May 24 2016 04:13:49

%S 1,9,17,36,64,65,89,100,108,129,145,196,225,233,252,289,297,316,388,

%T 441,449,464,505,512,537,548,576,577,593,633,729,730,737,745,784,792,

%U 793,801,841,873,1000,1025,1088,1090,1116,1225,1289,1296,1304,1305,1367

%N Sum of a square and a nonnegative cube in more than one way.

%H T. D. Noe, <a href="/A055393/b055393.txt">Table of n, a(n) for n = 1..10000</a>

%e a(12) = 225 since 225 = 6^3 + 3^2 = 5^3 + 10^2 = 0^3 + 15^2.

%t nn = 2000; t = Table[0, {nn}]; Do[n = i^2 + j^3; If[0 < n <= nn, t[[n]]++], {i, 0, Sqrt[nn]}, {j, 0, nn^(1/3)}]; Flatten[Position[t, _?(# > 1 &)]] (* _T. D. Noe_, Dec 08 2012 *)

%Y Cf. A022549, A055394.

%K nice,nonn

%O 1,2

%A _Henry Bottomley_, May 12 2000

%E Extended by _T. D. Noe_, Dec 08 2012

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Last modified April 25 10:01 EDT 2024. Contains 371967 sequences. (Running on oeis4.)