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A124272
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Primes in A124271, or primes of the form Sum_{i=1..n} (prime(i)^n - 1)/(prime(i) - 1).
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1
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OFFSET
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1,1
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COMMENTS
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The corresponding n are 2, 8, 14, ...
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LINKS
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EXAMPLE
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7 is a term because A124271(2) = 7 is prime.
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MATHEMATICA
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Do[f=Sum[(Prime[i]^n-1)/(Prime[i]-1), {i, 1, n}]; If[PrimeQ[f], Print[{n, f}]], {n, 1, 100}]
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CROSSREFS
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KEYWORD
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bref,hard,more,nonn
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AUTHOR
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STATUS
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approved
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