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A081370
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Numbers k such that binomial(k^2, k) reduced mod k^2 is 0.
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6
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1, 30, 105, 120, 132, 231, 252, 380, 495, 520, 595, 616, 630, 680, 756, 858, 870, 924, 1040, 1155, 1173, 1365, 1428, 1463, 1547, 1610, 1722, 1768, 1820, 1953, 1976, 1995, 2002, 2016, 2080, 2093, 2170, 2184, 2277, 2310, 2508, 2520, 2530, 2552, 2618, 2622
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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Do[s=Mod[Binomial[n^2, n], n^2]; If[s==0, Print[n]], {n, 1, 10000}]
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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