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A075405
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a(n)^2 is the square obtained in A075404 (or 0 if no such square exists).
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4
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70, 0, 5, 0, 0, 0, 92, 0, 106, 0, 2001863, 0, 652, 0, 679, 0, 138, 77, 0, 29, 724, 413, 0, 0, 182, 0, 253, 385, 0, 1612, 0, 8687, 0, 0, 0, 0, 0, 143, 0, 0, 0, 0, 0, 274, 0, 0, 0, 0, 0, 1281, 0, 1012, 0, 0, 121268, 0, 0, 56855, 0, 440, 0, 0, 0, 3069, 2725, 0, 655, 0, 0, 0, 0, 0, 1525, 4035066, 0, 430, 0, 0, 0, 0, 0, 0, 2619, 0, 0, 0, 795, 0, 0, 0, 3465, 0, 0, 0, 0, 0, 0, 0, 0, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| See A180244.
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EXAMPLE
| a(1) = 70 because 1^2+...+24^2 = a(1)^2 = 70^2.
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MATHEMATICA
| s[n_, k_]:=Module[{m=n+k-1}, (m(m+1)(2m+1)-n(n-1)(2n-1))/6]; mx=40000; Table[k=2; While[k<mx && !IntegerQ[Sqrt[s[n, k]]], k++]; If[k==mx, 0, Sqrt[s[n, k]]], {n, 100}]
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CROSSREFS
| Cf. A000330, A075404, A075406.
Sequence in context: A116099 A116238 A136114 * A177808 A036183 A184886
Adjacent sequences: A075402 A075403 A075404 * A075406 A075407 A075408
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KEYWORD
| nonn
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AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com), Sep 13 2002
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EXTENSIONS
| Corrected and extended by Lior Manor (lior.manor(AT)gmail.com) Sep 19 2002
Corrected and edited by T. D. Noe (noe(AT)sspectra.com), Jan 21 2011
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