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A130442
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Even pseudoprimes to base 41.
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14
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4, 8, 10, 20, 40, 344, 4870, 6892, 17230, 68920, 250820, 296440, 317032, 368722, 369370, 451426, 472312, 473240, 632270, 2326472, 3186730, 3429190, 4438760, 4670956, 4948456, 5509540, 8990356, 11817604, 11841436, 13094342, 17668360
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Do[ f=PowerMod[ 41, 2n-1, 2n ]; If[ f==1, Print[ 2n ] ], {n, 2, 500000} ]
lst = {}; Do[ If[ PowerMod[41, 2n - 1, 2n] == 1, AppendTo[lst, 2n]], {n, 2, 2^31}]; lst (* Robert G. Wilson v, Jun 01 2007 *)
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CROSSREFS
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Cf. A020169 = Pseudoprimes to base 41.
Cf. A006935 = Even pseudoprimes (or primes) to base 2: n divides 2^n - 2, n even.
Cf. A130433 = Even pseudoprimes to base 3.
Cf. A090082 = Even pseudoprimes to base 5.
Cf. A020169, A006935, A130433, A090082, A090083, A090084, A090085, A130434, A130435, A130436, A130437, A130438, A130439, A130440, A130441, A130443.
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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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