131091domain: NAppears in sequencesa(n) = 1 + 2^(n-1) + n for n > 0, a(0) = 2.at n=18A052968Sums of three Fermat numbers.at n=32A155877Numbers n such that m + (sum of digits in base-4 representation of m) = n has exactly three solutions.at n=27A230635Positions of 0 in A288381; complement of A288383.at n=19A288382