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Search: id:A127722
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| A127722 |
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Floor of square root of sum of squares of n consecutive odd numbers. |
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+0
2
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| 1, 3, 5, 9, 12, 16, 21, 26, 31, 36, 42, 47, 54, 60, 67, 73, 80, 88, 95, 103, 111, 119, 127, 135, 144, 153, 161, 171, 180, 189, 199, 208, 218, 228, 239, 249, 259, 270, 281, 292, 303, 314, 325, 336, 348, 360, 372, 383, 396, 408, 420, 432, 445, 458, 470, 483, 496
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(n) = A000196[A000447(n)]. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 28 2007
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MAPLE
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A000447 := proc(n) binomial(2*n+1, 3) ; end: A000196 := proc(n) floor(sqrt(n)) ; end: A127722 := proc(n) A000196(A000447(n)) ; end: for n from 1 to 30 do printf("%d, ", A127722(n)) ; od ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 28 2007
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MATHEMATICA
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a = {}; k = 0; Do[k = k + x^2; AppendTo[a, Floor[Sqrt[k]]], {x, 1, 150, 2}]; a
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CROSSREFS
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Cf. A127719, A127720, A127721.
Sequence in context: A061562 A006282 A086845 this_sequence A060419 A005766 A046746
Adjacent sequences: A127719 A127720 A127721 this_sequence A127723 A127724 A127725
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Jan 25 2007
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