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Search: id:A076389
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| A076389 |
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Sum of squares of numbers that cannot be written as t*n + u*(n+1) for nonnegative integers t,u. |
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+0
8
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| 0, 1, 30, 220, 950, 3045, 8036, 18480, 38340, 73425, 131890, 224796, 366730, 576485, 877800, 1300160, 1879656, 2659905, 3693030, 5040700, 6775230, 8980741, 11754380, 15207600, 19467500, 24678225, 31002426, 38622780, 47743570
(list; graph; listen)
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OFFSET
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1,3
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REFERENCES
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Fred. Schuh, Vragen betreffende een onbepaalde vergelijking, Nieuw Tijdschrift voor Wiskunde, 52 (1964-1965) 193-198.
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FORMULA
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n^2*(n^2-1)*(n^2-n-1)/12. G.f.:(1+23*x+31*x^2+5*x^3)*x^2/(1-x)^7
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MAPLE
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seq(n^2*(n^2-1)*(n^2-n-1)/12, n=1..40);
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CROSSREFS
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Cf. A002417.
Sequence in context: A069965 A061661 A042754 this_sequence A156372 A064241 A080569
Adjacent sequences: A076386 A076387 A076388 this_sequence A076390 A076391 A076392
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KEYWORD
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easy,nonn
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AUTHOR
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Floor van Lamoen (fvlamoen(AT)hotmail.com), Oct 09 2002
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