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A197113
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Nonprime numbers n such that the greatest residue of the congruence x^n (mod n) equals n-1 where x = 0..n-1.
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0
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1, 9, 10, 15, 21, 25, 26, 27, 33, 34, 35, 39, 45, 49, 50, 51, 55, 57, 58, 63, 65, 69, 74, 75, 77, 81, 82, 85, 87, 91, 93, 95, 99, 105, 106, 111, 115, 117, 119, 121, 122, 123, 125, 129, 130, 133, 135, 141, 143, 145, 146, 147, 153, 155, 159, 161, 165, 169, 170
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OFFSET
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1,2
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COMMENTS
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For all primes n, the greatest residue of the congruence x^n (mod n) where x = 0..n-1 equals n-1.
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LINKS
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EXAMPLE
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50 is in the sequence because the residues of the congruence x^50 (mod 50) are { 0, 1, 24, 25, 26, 49} and the greatest value is 50 - 1 = 49.
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MAPLE
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with(numtheory):T:=array(1..170): for n from 1 to 170 do:for k from 1 to n do:T[k]:=irem(k^n, n):od:W:=convert(T, set):x:=nops(W):if type(n, prime) = false and W[x]= n-1 then printf(`%d, `, n):else fi:od:
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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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