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Search: id:A123053
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| A123053 |
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Sum of a positive square, a positive cube and a positive fourth power. |
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+0
1
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| 3, 6, 10, 11, 13, 18, 21, 25, 26, 27, 28, 29, 32, 33, 34, 37, 40, 42, 44, 45, 47, 49, 51, 52, 53, 58, 59, 60, 64, 66, 68, 69, 73, 74, 77, 79, 81, 83, 84, 88, 89, 90, 91, 92, 96, 98, 101, 102, 105, 107, 108, 109
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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{A000290 \ 0} + {A000578 \ 0} + {A000583}. {a^4 + b^3 + c^2 for a,b,c>0}.
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EXAMPLE
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a(1) = 3 = 1^4 + 1^3 + 1^2.
a(2) = 6 = 1^4 + 1^3 + 2^2.
a(3) = 10 = 1^4 + 2^3 + 1^2.
a(4) = 11 = 1^4 + 1^3 + 3^2.
a(5) = 13 = 1^4 + 2^3 + 2^2.
a(6) = 18 = 1^4 + 1^3 + 4^2 = 1^4 + 2^3 + 3^2 = 2^4 + 1^3 + 1^2.
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CROSSREFS
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Cf. A000290, A000578, A000583, A055394 Numbers that are the sum of a positive square and a positive cube.
Sequence in context: A135738 A073851 A043321 this_sequence A138289 A105359 A105355
Adjacent sequences: A123050 A123051 A123052 this_sequence A123054 A123055 A123056
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KEYWORD
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easy,nonn
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AUTHOR
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Jonathan Vos Post (jvospost3(AT)gmail.com), Sep 25 2006
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