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A245529
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Numbers n such that 12^phi(n) == 1 (mod n^2), where phi(n) is Euler's totient function.
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8
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2693, 123653, 1812389, 2349407, 12686723, 201183431, 332997529, 3822485189, 6326953051, 54520709801, 224107337017, 272603549005, 541786979683, 1035893486219, 1568751359119, 4258039403323, 5179467431095, 10293952613977, 29806275823261
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OFFSET
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1,1
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COMMENTS
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a(8) > 10^9.
If a(n) is prime, it is in A111027.
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LINKS
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MAPLE
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MATHEMATICA
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Select[Range[10^5], PowerMod[12, EulerPhi[#], #^2] == 1 &] (* Alonso del Arte, Jul 27 2014 *)
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PROG
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(PARI) for(n=2, 1e9, if(Mod(12, n^2)^(eulerphi(n))==1, print1(n, ", ")))
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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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