27426

Appears in sequences

• Expansion of g.f. 1/((1-x)*(1-2*x)*(1-7*x)).at n=5A016201
• Number of primes <= the n-th Fibonacci number.at n=28A054782
• Number of primes < Fibonacci(n).at n=28A182564
• Triangle read by rows. T(n, k) = 1 if k = 0, equals T(n, k-1) if k = n, and otherwise is (n - k + 1) * (2 * (n - k) + 1) * T(n, k - 1) + T(n - 1, k).at n=30A365672
• Irregular table read by rows: T(n,k) is the number of k-sided polygons, for n>=1 and k>=3, in a hexagon when straight line segments connect the n-1 points between each corner that divide each edge into n equal parts to the n-1 points on the edge on the opposite side of the hexagon.at n=59A367665
• Lower (1/2,1/3) midsequence of (n^2) and (n^3); see Comments.at n=43A389582