1,1

15 is in the sequence because (15+1)*15^15-1 = 16*15^15-1 = 7006302246093749999, which is prime.

Sequence in context: A007885 A003037 A046420 this_sequence A006456 A018134 A015856

Adjacent sequences: A108315 A108316 A108317 this_sequence A108319 A108320 A108321

more,nonn

Ray G. Opao (1260(AT)email.com), Jun 30 2005