228488

Appears in sequences

• Denominator of sum of -4th powers of divisors of n.at n=25A017672
• Numbers of the form (8^i)*(13^j), with i, j >= 0.at n=19A107764
• a(1) = 2, a(2) = 8; a(n) = 2 a(n - 1) + a(n - 2) - 4*(n mod 2).at n=13A162484
• a(n) = ceiling((n+1)^4/2).at n=25A171714
• Products of the 4th power of a prime and a distinct prime of power 3 (p^4*q^3).at n=19A179666
• Half the number of n X 2 binary arrays with no element equal to a strict majority of its knight-move neighbors.at n=15A183393
• Number of compositions of odd natural numbers into 4 parts <= n.at n=25A191903
• Number of subsets of the set {1,2,...,n} which do not contain two elements whose difference is 5.at n=24A208742
• Number of 2 X 2 matrices with all terms in {0,1,...,n} and even trace.at n=25A210378
• Number of 2 X 2 matrices with all terms in {0,1,...,n} and odd trace.at n=25A210379
• Numbers with 5 odd divisors.at n=38A267696
• Numbers whose prime factors are 2 and 13.at n=32A288162
• Numbers k such that k^3 is the sum of two nonzero 4th powers.at n=14A291849
• Numbers whose sum of squarefree divisors and sum of nonsquarefree divisors are both squarefree numbers.at n=32A300984
• Square array T(n,k), n >= 1, k >= 1, read by antidiagonals, where T(n,k) = sqrt( Product_{a=1..n} Product_{b=1..k} (4*sin((2*a-1)*Pi/(2*n))^2 + 4*sin((2*b-1)*Pi/k)^2) ).at n=34A341533
• a(n) = sqrt( Product_{j=1..n} Product_{k=1..2} (4*sin((2*j-1)*Pi/(2*n))^2 + 4*sin((2*k-1)*Pi/2)^2) ).at n=6A341543
• Square array T(n,k), n >= 1, k >= 1, read by antidiagonals, where T(n,k) = Product_{a=1..n-1} Product_{b=1..k} (4*sin(a*Pi/n)^2 + 4*sin((2*b-1)*Pi/(2*k))^2).at n=29A341739
• Square array T(n,k), n >= 1, k >= 1, read by antidiagonals downwards: number of perfect matchings in the graph C_{2n} x C_k.at n=34A341741