1,1

6*3*(2^2-1)-1=53 prime 2^2-1=M(1) 3=p(2) so j(1)=2 6*2*(2^3-1)-1=83 prime 2^3-1=M(2) 2=p(1) so j(2)=1

Sequence in context: A105778 A088931 A088980 this_sequence A002852 A099875 A079499

Adjacent sequences: A157330 A157331 A157332 this_sequence A157334 A157335 A157336

nonn

Pierre CAMI (pierre-cami(AT)orange.fr), Feb 27 2009