39691domain: NAppears in sequencesInterprimes which are of the form s*prime, s=19.at n=9A075294a(n) = Sum_{k=0..floor(n/6)} C(n-3k,3k) * 2^k.at n=22A100135Numerators of the partial alternating sums of the reciprocals of the sum of unitary divisors function (A034448).at n=17A379515