Characteristic function of numbers having only factors that are Pierpont primes.
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1
1 seqfan posts
Wed Feb 16 21:21:33 CET 2011 [seqfan] Re: multiplicative set-like sequences