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%I #11 Aug 02 2015 02:08:10
%S 4,8,10,20,40,344,4870,6892,17230,68920,250820,296440,317032,368722,
%T 369370,451426,472312,473240,632270,2326472,3186730,3429190,4438760,
%U 4670956,4948456,5509540,8990356,11817604,11841436,13094342,17668360
%N Even pseudoprimes to base 41.
%H Robert G. Wilson v, <a href="/A130442/b130442.txt">Table of n, a(n) for n = 1..146</a>.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/FermatPseudoprime.html">Fermat Pseudoprime</a>.
%H <a href="/index/Ps#pseudoprimes">Index entries for sequences related to pseudoprimes</a>
%t Do[ f=PowerMod[ 41, 2n-1, 2n ]; If[ f==1, Print[ 2n ] ], {n,2,500000} ]
%t lst = {}; Do[ If[ PowerMod[41, 2n - 1, 2n] == 1, AppendTo[lst, 2n]], {n, 2, 2^31}]; lst (* _Robert G. Wilson v_, Jun 01 2007 *)
%Y Cf. A020169 = Pseudoprimes to base 41.
%Y Cf. A006935 = Even pseudoprimes (or primes) to base 2: n divides 2^n - 2, n even.
%Y Cf. A130433 = Even pseudoprimes to base 3.
%Y Cf. A090082 = Even pseudoprimes to base 5.
%Y Cf. A090083, A090084, A090085.
%Y Cf. A130434, A130435, A130436, A130437, A130438, A130439, A130440, A130441, A130443.
%Y Cf. A020169, A006935, A130433, A090082, A090083, A090084, A090085, A130434, A130435, A130436, A130437, A130438, A130439, A130440, A130441, A130443.
%K nonn
%O 1,1
%A _Alexander Adamchuk_, May 26 2007
%E More terms from _Robert G. Wilson v_, Jun 01 2007
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