1,1

1*23*(1*23-1)-1=505 composite

2*23*(2*23-1)-1=2069 prime so k(1)=2 P(1)=2069

Cf. A141233 A141234 A141235 A141236 A141237 A141239 A141240.

Sequence in context: A121721 A136156 A155796 this_sequence A094690 A010249 A002431

Adjacent sequences: A141235 A141236 A141237 this_sequence A141239 A141240 A141241

nonn

Pierre CAMI (pierrecami(AT)tele2.fr), Jun 16 2008