1,2

1*2/2 +1 = 2 prime so a(1)=1 as 2=p(1)

1*2*3/(2*3) +1 = 2 prime so a(2)=2 as 3=p(2)

1*2*3*4*5/(2*3*5) +1 = 5 prime so a(3)=3 as 5=p(3)

Sequence in context: A054313 A080052 A097961 this_sequence A112098 A085326 A062308

Adjacent sequences: A124080 A124081 A124082 this_sequence A124084 A124085 A124086

more,nonn

Pierre CAMI (pierrecami(AT)tele2.fr), Nov 25 2006