

A129219


Residues of the Lucas  Lehmer primality test for M(7) = 127.


7




OFFSET

0,1


COMMENTS

Since a(5) = 0, M(7) is prime.


LINKS

Table of n, a(n) for n=0..5.
Eric Weisstein's World of Mathematics, Lucas Lehmer Test.
Wikipedia, Lucas Lehmer Primality Test).


FORMULA

a(0) = 4 a(n) = a(n1)^2 mod 2^p1 Last term: a(p2)


EXAMPLE

a(5)= 111^2  2 mod 127 = 0


CROSSREFS

Cf. A095847, A003010, A129220, A129221, A129222, A129223, A129224, A129225, A129226.
Sequence in context: A119857 A126787 A187742 * A007025 A221538 A014512
Adjacent sequences: A129216 A129217 A129218 * A129220 A129221 A129222


KEYWORD

fini,full,nonn


AUTHOR

Sergio Pimentel, Apr 04 2007


STATUS

approved



