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A076600
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a(n) = smallest k>n such that n^2+k^2 is a perfect square, or 0 if no such k exists.
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11
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1, 0, 0, 4, 0, 12, 8, 24, 15, 12, 24, 60, 16, 84, 48, 20, 30, 144, 24, 180, 21, 28, 120, 264, 32, 60, 168, 36, 45, 420, 40, 480, 60, 44, 288, 84, 48, 684, 360, 52, 42, 840, 56, 924, 117, 60, 528, 1104, 55, 168, 120, 68, 165, 1404, 72, 132, 90, 76, 840, 1740, 63, 1860
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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EXAMPLE
| a(3)=4 because 3^2+4^2=5^2; a(17)=144 because 17^2+144^2=145^2.
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MATHEMATICA
| f[ n_ ] := Block[ {k = n + 1}, While[ ! IntegerQ[ Sqrt[ n^2 + k^2 ] ], k++ ]; k ]; Join[ {1, 0, 0, 4, 0}, Table[ f[ n ], {n, 5, 61} ] ]
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PROG
| (PARI) a(n)=for(m=n+1, n^2\2+1, if(issquare(m^2+n^2), return(m))); 0 - Michael Somos Mar 03 2004
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CROSSREFS
| Sequence in context: A072194 A151921 A141554 * A002978 A170878 A056460
Adjacent sequences: A076597 A076598 A076599 * A076601 A076602 A076603
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KEYWORD
| easy,nonn
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AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com), Oct 21 2002
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EXTENSIONS
| Edited by Robert G. Wilson v (rgwv(AT)rgwv.com), Oct 23 2002
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