425465

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 68.at n=11A031656
• Sort then Add, a(1)=29.at n=20A033904
• Number of pairs of functions f, g, from a size n set into itself satisfying f(g(g(x))) = g(g(f(x))).at n=5A239779