1,2

A subsequence of A050412.

Cf. A050412, A051914, A052333, A052334, A052340.

Sequence in context: A032498 A144613 A031330 this_sequence A123076 A103020 A024353

Adjacent sequences: A052336 A052337 A052338 this_sequence A052340 A052341 A052342

nonn,hard

Christian G. Bower (bowerc(AT)usa.net), Dec 23 1999

659*2^n-1 is composite for n<2^17.

One more term supplied by David Broadhurst (D.Broadhurst(AT)open.ac.uk), Jan 02 2000