38118domain: NAppears in sequencesNumber of noninvertible prime knots with n crossings (A002863-A052402).at n=13A052403Indices k such that A020507(k)=Phi[k](-8) is prime, where Phi is a cyclotomic polynomial.at n=40A138922Number of 8-element subsets of {1, 2, ..., n} having pairwise coprime elements.at n=21A186984