1,1

2*2-1=3 prime 2=p(1)# so a(1)=2

2*3*2-1=11 prime 2*3=p(2)# so a(2)=2

2*3*5*2-1=59 prime 2*3*5=p(3)# so a(3)=2

2*3*5*7*2-1=419 prime 2*3*5*7=p(4)# so a(4)=2

2*3*5*7*11*2*3-1=13859 prime 2*3*5*7*11=p(5)# so a(5)=3

Sequence in context: A058744 A152724 A081743 this_sequence A023516 A156607 A093450

Adjacent sequences: A118374 A118375 A118376 this_sequence A118378 A118379 A118380

nonn

Pierre CAMI (pierrecami(AT)tele2.fr), May 15 2006