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1,1
Table of n, a(n) for n=1..30.
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: A088980 A254436 A208548 * A002852 A266081 A188440
Adjacent sequences: A157330 A157331 A157332 * A157334 A157335 A157336
nonn
Pierre CAMI, Feb 27 2009
approved