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A226105
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Numbers k such that phi(k)+3 divides k+3, excluding numbers of the form 6*p for a prime p.
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1
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OFFSET
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1,2
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COMMENTS
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LINKS
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MATHEMATICA
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Select[Range[10000000], !PrimeQ[#/6] && IntegerQ[(# + 3)/(EulerPhi[#] + 3)] &]
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PROG
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(PARI) for(n=1, 10^8, if( (n+3)%(eulerphi(n)+3)==0 && (n%6 || !isprime(n\6)), print(n)));
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CROSSREFS
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KEYWORD
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nonn,hard,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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