A130434 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A130434

Even pseudoprimes to base 7.

6, 16806, 29234, 67798, 791578, 1234806, 1807566, 2427706, 12562534, 29147626, 29783134, 38357866, 41716918, 50167486, 99392626, 111664666, 162474586, 169707826, 281780346, 286351066, 349880326, 423200566, 463054594, 479581642

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

OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..163 (terms below 10^12, calculated from the b-file at A005938; terms 1..37 from Robert G. Wilson v)

Eric Weisstein's World of Mathematics, Fermat Pseudoprime.

Index entries for sequences related to pseudoprimes.

MATHEMATICA

lst = {}; Do[ If[ PowerMod[7, 2n - 1, 2n] == 1, AppendTo[lst, 2n]; Print[2n]], {n, 2, 24000000}]; lst (* Robert G. Wilson v, May 28 2007 *)

CROSSREFS