123921domain: NAppears in sequencesNumbers k such that phi(k) + k is a fourth power.at n=34A114072Wiener index of a benzenoid consisting of a zig-zag chain of n hexagons (s=13; see the Gutman et al. reference).at n=27A193393Denominators of the Nash equilibrium of guesses for the number guessing game with n numbers.at n=25A286677