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A066974
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Integers of the form (1/m)*sum(i=1,m,binomial(2i,i)).
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0
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2, 4, 70, 2197, 86944, 305045, 184940110, 480921672850, 1390639119568762, 13871716673121190349872, 46286334476836197400150816, 158305268738561655232891129492, 552015921314537446560239006496196
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Select[Table[Sum[Binomial[2i, i]/m, {i, m}], {m, 60}], IntegerQ] (* Harvey P. Dale, Dec 23 2014 *)
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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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