134217702domain: NAppears in sequencesa(n) = 2^(n+1) - n.at n=25A095768a(n) = largest multiple of n which is <= 2^n.at n=26A128092Row sums of triangle A132044.at n=27A132045a(n) = the largest positive multiple of n with exactly n digits when written in binary.at n=26A162214