OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..183
FORMULA
a(n) >= A089158(n). - R. J. Mathar, May 01 2008
MATHEMATICA
FactorInteger[2^#-1][[-1, 1]]&/@Select[Prime[Range[40]], !PrimeQ[2^#-1]&] (* Harvey P. Dale, May 05 2012 *)
With[{c=Complement[Prime[Range[PrimePi[200]]], MersennePrimeExponent[ Range[ 15]]]}, Table[ FactorInteger[ 2^p-1][[-1, 1]], {p, c}]] (* Harvey P. Dale, Sep 06 2021 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Dec 11 2007
EXTENSIONS
Corrected by Harvey P. Dale, May 05 2012
STATUS
approved