1,1
2*2+1=5, 5 prime so a(1)=2
2*2*3+1=13, 13 prime so a(2)=3
2*2*3*5+1=61, 61 prime so a(3)=5
Cf. A119833 A119835.
Sequence in context: A028867 A104154 A123214 * A095180 A101989 A098922
Adjacent sequences: A119831 A119832 A119833 * A119835 A119836 A119837
nonn
Pierre CAMI (pierre-cami(AT)bbox.fr), May 25 2006
