34106domain: NAppears in sequencesG.f.: (1+x+x^2+x^3)/(1-x^2-2*x^3-x^4+x^6).at n=23A234273Numerator of the barycenter of first n primes defined as a(n) = numerator(Sum_{i=1..n} (i*prime(i)) / Sum_{i=1..n} prime(i)).at n=41A306834Expansion of Sum_{k>0} x^(2*k)/(1+x^k)^5.at n=29A363613