0,1
3*2^(10^0)-1=5 prime so i(0)=2
3*2^(10^1)-1=3071=37*83 composite
5*2^(10^1)-1=5119 prime so i(1)=3
Sequence in context: A113700 A065646 A090508 this_sequence A090231 A062641 A037424
Adjacent sequences: A126713 A126714 A126715 this_sequence A126717 A126718 A126719
nonn
Pierre CAMI (pierrecami(AT)tele2.fr), Feb 13 2007
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