A130439 - OEIS

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A130439

Even pseudoprimes to base 29.

4, 14, 28, 52, 268, 364, 1876, 3484, 5356, 7294, 24388, 66788, 283276, 286492, 339556, 404236, 860692, 1153684, 1381132, 1478764, 1696708, 2073722, 2182726, 2222122, 4922164, 7790146, 8200036, 9679138, 10881052, 14863516, 15476266

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..279 (terms below 10^11; terms 1..121 from Robert G. Wilson v)

Eric Weisstein's World of Mathematics, Fermat Pseudoprime.

Index entries for sequences related to pseudoprimes.

MATHEMATICA

Do[ f=PowerMod[ 29, 2n-1, 2n ]; If[ f==1, Print[ 2n ] ], {n, 2, 500000} ]

lst = {}; Do[ If[ PowerMod[17, 2n - 1, 2n] == 1, AppendTo[lst, 2n]], {n, 2, 2^31}]; lst (* Robert G. Wilson v, Jun 01 2007 *)

PROG

(PARI) is(k) = k > 2 && !(k % 2) && Mod(29, k)^(k-1) == 1; \\ Amiram Eldar, Sep 29 2024