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Search: id:A075405
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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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+0
3
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| 70, 4183065, 5, 4136098, 4127715, 4152761, 92, 4132495, 106, 4141001, 2001863, 4158557, 652, 4126584, 679, 4149848, 138, 77, 4210471, 29, 724, 413, 4143982, 4050962, 182, 4219303, 253, 385, 4133495, 1612, 4129972, 8687
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(1) = 70 because 1^2+...+24^2 = a(1)^2 = 70^2.
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MATHEMATICA
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n=32; sp=", "; Do[If[IntegerQ[b=(a(a+1)(2a+1)/6-(k(k+1)(2k+1)/6)/.k->(n-1))^(1/2)], Print[n, sp, a, sp, b, sp, a-n+1]], {a, n+1, 400000}]
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CROSSREFS
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Cf. A000330, A075404, A075406.
Sequence in context: A005983 A146499 A014608 this_sequence A066789 A103165 A116276
Adjacent sequences: A075402 A075403 A075404 this_sequence A075406 A075407 A075408
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KEYWORD
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nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Sep 13 2002
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EXTENSIONS
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Corrected and extended by Lior Manor (lior.manor(AT)gmail.com) Sep 19 2002
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