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A057284
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Numbers n such that n | 9^n + 8^n + 7^n + 6^n + 5^n + 4^n + 3^n + 2^n.
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0
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1, 2, 4, 11, 121, 142, 1331, 5269, 14641, 15332, 49444, 158447, 161051, 1005037, 1119337, 1246421, 1771561, 3380954, 19487171, 64581451, 127984967, 144492029, 214358881, 259650149, 295850687, 394178917, 2357947691
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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Select[ Range[ 10^6 ], Mod[ PowerMod[ 9, #, # ] + PowerMod[ 8, #, # ] + PowerMod[ 7, #, # ] + PowerMod[ 6, #, # ] + PowerMod[ 5, #, # ] + PowerMod[ 4, #, # ] + PowerMod[ 3, #, # ] + PowerMod[ 2, #, # ], # ] == 0 & ]
Select[Range[2000000], Divisible[Total[PowerMod[Range[2, 9], #, #]], #]&] (* Harvey P. Dale, Feb 05 2013 *)
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PROG
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(PARI) is(n)=my(n2=Mod(2, n)^n, n3=Mod(3, n)^n); n2+n3+n2^2+Mod(5, n)^n+n2*n3+ Mod(7, n)^n+n2^3+n3^2==0 \\ Charles R Greathouse IV, Feb 28 2012
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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