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A130433
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Even pseudoprimes to base 3.
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12
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286, 24046, 232726, 1304446, 1707266, 2232026, 3197806, 3922126, 4446982, 5603326, 5886166, 10123366, 10169926, 12304774, 13658086, 45133726, 47766286, 52249654, 62656126, 75421126, 76254046, 91459126, 91612246, 96956926
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OFFSET
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1,1
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COMMENTS
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The first 27 terms (halved) are given in Table 1 by Paszkiewicz and Rotkiewicz. - R. J. Mathar, Aug 22 2012
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LINKS
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Table of n, a(n) for n=1..24.
A. Paszkiewicz and A. Rotkiewicz, On a Problem of H. J. A. Duprac, Tatra Mt. Math. Publ. 32 (2005) 15-32, MR2206908
Eric Weisstein's World of Mathematics, Fermat Pseudoprime.
Index entries for sequences related to pseudoprimes
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MATHEMATICA
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Do[ f=PowerMod[ 3, 2n-1, 2n ]; If[ f==1, Print[ 2n ] ], {n, 2, 7000000} ]
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CROSSREFS
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Cf. A005935 = Pseudoprimes to base 3. Cf. A006935 = Even pseudoprimes (or primes) to base 2: n divides 2^n - 2, n even. Cf. A090082 = Even pseudoprimes to base 5. Cf. A090083, A090084, A090085. Cf. A130434, A130435, A130436, A130437, A130438, A130439, A130440, A130441, A130442, A130443.
Sequence in context: A072817 A117994 A221431 * A140926 A203049 A157997
Adjacent sequences: A130430 A130431 A130432 * A130434 A130435 A130436
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KEYWORD
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nonn
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AUTHOR
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Alexander Adamchuk, May 26 2007, Jun 17 2007
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EXTENSIONS
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More terms from Alexander Adamchuk, Jun 17 2007
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STATUS
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approved
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