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A227429
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Numbers k such that Sum_{j=1..k} j^phi(j) == 0 (mod k).
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8
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1, 3, 4, 12, 21, 39, 91, 156, 381, 1668, 3292, 4541, 6515, 12927, 49492, 72412, 100595, 158708
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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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EXAMPLE
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4 is a member of the sequence since Sum_{j=1..4} j^phi(j) = 1^phi(1) + 2^phi(2) + 3^phi(3) + 4^phi(4) = 1^1 + 2^1 + 3^2 + 4^2 = 28 which is divisible by 4.
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MAPLE
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with(numtheory); ListA227429:=proc(q) local i, n;
for n from 1 to q do if add(i^phi(i), i=1..n) mod n=0 then print(n);
fi; od; end: ListA227429(10^6);
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CROSSREFS
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KEYWORD
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nonn,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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