78632domain: NAppears in sequencesNumbers k such that 10^k + 81 is prime.at n=17A137848Number of chiral pairs of color patterns (set partitions) in a cycle of length n using 3 or fewer colors (subsets).at n=14A320743Dirichlet convolution of A276086 (primorial base exp-function) with A055615 (Dirichlet inverse of n).at n=58A383286