68951

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 49 ones.at n=10A031817
• Composite numbers whose prime factors contain no digits other than 1 and 9.at n=29A036309
• The numbers n in s=n^2 + (n+1)^2 that satisfy the requirement for two consecutive squares c,d with c<d with d-c being the sum of two consecutive squares that c<s<d will give s-c and d-s both being squares.at n=36A192743
• Number of zero-sum -n..n arrays of 4 elements with adjacent element differences also in -n..n.at n=32A202254
• Smallest number x such that sigma(x) = sigma(x(n)), where x(n) is the n-th arithmetic derivatives of x and x is not equal to x(n).at n=5A246774
• a(n) = sqrt(1 + P(n)*P(n+1)*P(n+2)*P(n+3)) where P(n) = A000129(n) are the Pell numbers.at n=6A383225
• Triangle read by rows: T(n,k) is the number of unlabeled simple graphs with n vertices and treedepth k.at n=48A387046