1,2
1*7*7-1*7-1=41 prime so k(1)=1 P(1)=41
1*41*(1*41-1)-1=1639 composite
2*41*(2*41-1)-1=6641 composite
3*41*(3*41-1)-1=15005 composite
4*41*(4*41-1)-1=26731 prime so k(2)=4 P(2)=26731
1*26731*(1*26731-1)-1=714519629 prime so k(3)=1 P(3)=714519629
Cf. A141234 A141235 A141236 A141237 A141238 A141239 A141240.
Sequence in context: A077102 A192722 A057968 * A055139 A128041 A144885
Adjacent sequences: A141230 A141231 A141232 * A141234 A141235 A141236
nonn
Pierre CAMI (pierre-cami(AT)bbox.fr), Jun 16 2008
