37520

Appears in sequences

• Numbers k such that k*(k+1)/2 + 1 is a square.at n=12A006451
• Number of rooted 2-dimensional polyominoes with n pentagonal cells, with no symmetries removed.at n=6A051738
• Smallest number m such that m^2+1 is divisible by A002144(n)^2 (= squares of primes congruent to 1 mod 4).at n=30A059321
• Number of interior balls in a truncated tetrahedral arrangement.at n=21A092966
• Array read by antidiagonals: T(n,k) = number of rooted 2-dimensional polyominoes with k cells, the cells being regular n-gons, with no symmetries removed.at n=42A094166
• Duplicate of A051738.at n=6A094167
• a(n) = (1/2) * (5*P(n+1) + P(n) - 1), where P(k) are the Pell numbers A000129.at n=11A098586
• Let pi be an unrestricted partition of n with the summands written in binary notation. a(n) is the number of such partitions whose binary representation has an odd number of binary ones.at n=44A102437
• Number of labeled non-planar 2-connected K_{3,3}-free toroidal irreducible graphs having n vertices.at n=3A135380
• Triangle read by rows: T(n,k) is the number of partial bijections (or subpermutations) of an n-element set of height k (height(alpha) = |Im(alpha)|) and with exactly 1 fixed point.at n=31A144090
• Partial sums of ceiling(Fibonacci(n)/2).at n=23A179018
• Numbers k such that the distance between the k-th triangular number and the nearest square is at most 1.at n=23A229083
• Numbers k such that the distance between the k-th triangular number and the nearest square is exactly 1.at n=18A229131
• Numbers n such that n^2 + 1 has two distinct prime divisors less than n.at n=31A263876
• Coordination sequence for (2,3,9) tiling of hyperbolic plane.at n=39A265059
• Indices of triangular numbers that are eight times other triangular numbers.at n=6A336625
• Number of integer partitions of n whose distinct parts are the binary indices of some prime number.at n=49A372887