54487

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 21 ones.at n=35A031789
• Solution of the complementary equation a(n) = 3*a(n-1) + b(n-1) - 3, where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.at n=10A295136