

A145097


a(n) = largest divisor of the Mersenne composite A065341(n)


3



89, 178481, 2304167, 616318177, 164511353, 20408568497, 59862819377, 1416003655831, 3203431780337, 761838257287, 10334355636337793, 21514198099633918969, 224958284260258499201, 57912614113275649087721
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OFFSET

1,1


COMMENTS

Note that not all the largest divisors are primes.
Which divisors are prime?  see A145099. [From Artur Jasinski, Oct 04 2008]


LINKS

Table of n, a(n) for n=1..14.


MATHEMATICA

a = {}; Do[m = 2^Prime[n]  1; If[PrimeQ[m], null, AppendTo[a, Divisors[m][[ 2]]]], {n, 1, 40}]; a (*Artur Jasinski*)


CROSSREFS

A065341, A135975, A135980, A145098
Sequence in context: A089158 A145098 A136031 * A080051 A243316 A072314
Adjacent sequences: A145094 A145095 A145096 * A145098 A145099 A145100


KEYWORD

nonn


AUTHOR

Artur Jasinski, Oct 01 2008


STATUS

approved



