50534

Appears in sequences

• n is equal to the number of 2's in all numbers <= n written in base 6.at n=8A014891
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1)*b(n-2), where a(0) = 1, a(1) = 2, b(0) = 3, b(1) = 4, and (a(n)) and (b(n)) are increasing complementary sequences.at n=16A295367