319449domain: NAppears in sequencesa(n) = 3*n*(2^n - 1).at n=13A317404Numbers that are both binary palindromes and binary Niven numbers.at n=16A334529Odd composites k with more than 2 prime factors for which it holds that k = A048720(k/d, A065621(d)), for all divisor pairs (d, k/d), d <= k/d.at n=2A391252