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 A090084 Even pseudoprimes to base 11. 14
 10, 70, 190, 1330, 8170, 9730, 24130, 28462, 58030, 98458, 143830, 144886, 327370, 856786, 1580230, 1620130, 3536470, 5274970, 6082490, 6376126, 6792710, 8066170, 8610610, 14076910, 17728930, 27275158, 42447406, 52970386, 53497978, 68925130 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Robert G. Wilson v, Table of n, a(n) for n = 1..84. Eric Weisstein's World of Mathematics, Fermat Pseudoprime. MATHEMATICA Do[ f=PowerMod[ 11, 2n-1, 2n ]; If[ f==1, Print[ 2n ] ], {n, 2, 800000} ] (* Alexander Adamchuk, May 26 2007 *) lst = {}; Do[ If[ PowerMod[11, 2n - 1, 2n] == 1, AppendTo[lst, 2n]], {n, 2, 2*10^9}]; lst (* Robert G. Wilson v, Jun 01 2007 *) Select[Range[4, 68926000, 2], PowerMod[11, #-1, #]==1&] (* Harvey P. Dale, Oct 16 2021 *) CROSSREFS Cf. A020139. Cf. A020139, A006935, A130433, A090082, A090083, A090084, A090085, A130434, A130435, A130436, A130438, A130439, A130440, A130441, A130442, A130443. Sequence in context: A320228 A130548 A160662 * A025221 A271040 A005567 Adjacent sequences:  A090081 A090082 A090083 * A090085 A090086 A090087 KEYWORD nonn AUTHOR Labos Elemer, Nov 25 2003 EXTENSIONS More terms from Alexander Adamchuk, May 26 2007 Further terms from Robert G. Wilson v, Jun 01 2007 STATUS approved

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Last modified August 14 12:15 EDT 2022. Contains 356116 sequences. (Running on oeis4.)