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1, 37, 41, 43, 47, 49, 58, 65, 69, 81, 85, 92, 128, 130, 135, 136, 154, 184, 208, 220, 228, 450, 540, 840
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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No further terms below 143260.
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LINKS
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MATHEMATICA
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Select[ Range[10^3], Length[ FactorInteger[ Binomial[2#, # ]]] == PrimePi[ # ] + DivisorSigma[0, # ] & ]
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PROG
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(PARI) for(n=1, 1000, if(omega(binomial(2*n, n))=sum(i=1, n, isprime(i))+numdiv(n), print1(n, ", ")))
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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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