536870940domain: NAppears in sequencesa(n) = 2^n + n - 1.at n=29A052944a(n) = (1/n)*Sum_{k=1..n} k*2^gcd(n,k).at n=28A102688Row sums of triangle A132735.at n=29A132736a(n) = the smallest positive multiple of n with exactly n digits when written in binary.at n=29A162213