54679

Properties

Appears in sequences

• A014486-indices of binary trees whose left and right subtree are identical.at n=36A083938
• Triangle T(n,k) read by rows: T(n, k) = (4*n-4*k+1)*T(n-1, k-1) + (4*k-3)*T(n-1, k) + 4*T(n-2, k-1) with T(n, 1) = T(n, n) = 1.at n=29A144441
• Triangle T(n,k) read by rows: T(n, k) = (4*n-4*k+1)*T(n-1, k-1) + (4*k-3)*T(n-1, k) + 4*T(n-2, k-1) with T(n, 1) = T(n, n) = 1.at n=34A144441
• In this sequence each prime ends a prime century. Place a 0 between the final two digits, and raise the 100s digit by 1, to form the first prime of the next century.at n=5A156083
• Primes of the form 3n^2 + 4.at n=27A201477
• Number of n-bit binary strings in which the length of any run of ones is a power of two.at n=17A253511
• Primes p such that prime(p)^2 - 2 = prime(q) for some prime q.at n=45A261354
• Number of ways to choose a constant rooted partition of each part in a rooted partition of n.at n=25A301762
• Draw a regular n-gon and the enclosing circle, then for each pair of vertices X, Y, draw a circle with diameter XY; the union of these figures is the graph H_n; sequence gives number of regions in H_n.at n=25A370978
• Prime numbersat n=5565