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A090082 Even pseudoprimes to base 5. 13
4, 124, 5662, 11476, 59356, 80476, 91636, 250876, 261964, 482516, 1385836, 1892458, 1926676, 2428084, 2589796, 3743476, 4101796, 6797764, 9155476, 10701076, 10743436, 11263396, 13799836, 13859956, 15570556, 20396476 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

MATHEMATICA

Do[s=Mod[ -1+5^(n-1), n]; If[Equal[s, 0]&&!PrimeQ[n]&&EvenQ[n], Print[n]], {n, 1, 1000000}]

CROSSREFS

Cf. A005936.

Sequence in context: A005936 A197779 A197610 * A068891 A073351 A195797

Adjacent sequences:  A090079 A090080 A090081 * A090083 A090084 A090085

KEYWORD

nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu), Nov 25 2003

EXTENSIONS

More terms from Farideh Firoozbakht (mymontain(AT)yahoo.com), Sep 13 2006

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Last modified February 17 09:41 EST 2012. Contains 206009 sequences.