-104754domain: ZAppears in sequencesProduct_{k>=1} ((1 + x^k)^a(k)) = 1 + 4x.at n=9A038069Result of using the primes as coefficients in an infinite polynomial series in x and then expressing this series as (1+x)(1+a(1)*x)(1+a(2)*x^2) ... .at n=43A147541