55123

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 61 ones.at n=2A031829
• Number of subsets of A = {1,2,...,n} that have the same center of gravity as A, i.e., (n+1)/2.at n=21A070925
• a(n) = Fibonacci(n) concatenated with Lucas(n).at n=10A247338