58020domain: NAppears in sequencesa(n) = nextprime(3^n) - nextprime(2^n).at n=10A037128Ordered differences of numbers 3^j-2^j, as in A001047.at n=37A205105Numbers k such that Bernoulli number B_{k} has denominator 56786730.at n=10A295598a(n) = Sum_{k=0..floor(n/2)} binomial(k+2,2) * binomial(k,2*(n-2*k)).at n=26A392252