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Search: id:A145553
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| A145553 |
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Numbers n such that n^2 can be expressed as the sum of 2 cubes in 2 different ways |
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+0
2
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| 77976, 223587, 623808, 894348, 1788696, 2105352, 2989441, 4298427, 4672423, 4990464, 5986575, 6036849, 7154784, 8437832, 9747000
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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This is conjectured to be an infinite sequence
Subsequence of A051302. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 14 2008]
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EXAMPLE
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a(1): 77976^2 = 6080256576 = 1824^3 + 228^3 = 1710^3 + 1026^3; a(2): 223587^2 = 49991146569 = 3666^3 + 897^3 = 3276^3 + 2457^3; a(3): 623808^2 = 389136420864 = 7296^3 + 912^3 = 6840^3 + 4104^3; a(4): 894348^2 = 799858345104 = 9282^3 + 546^3 = 9009^3 + 4095^3
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CROSSREFS
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A145552
Sequence in context: A133973 A133974 A061528 this_sequence A051302 A016819 A016855
Adjacent sequences: A145550 A145551 A145552 this_sequence A145554 A145555 A145556
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KEYWORD
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nonn
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AUTHOR
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Iain Renfrew (iain.renfrew(AT)btinternet.com), Oct 13 2008
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EXTENSIONS
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a(5)-a(15) from Zak Seidov (zakseidov(AT)yahoo.com), Oct 15 2008
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