326041

Appears in sequences

• Duplicate of A006253.at n=10A003697
• Number of perfect matchings (or domino tilings) in C_4 X P_n.at n=10A006253
• Indices of octagonal numbers which are also squares.at n=5A046184
• Numbers n such that sigma(d(n^3))==d(sigma(n^2)), where d(n) is the number of divisors of n.at n=35A063797
• Numbers k such that sigma_4(k)/sigma_2(k) is prime.at n=26A066109
• a(n) = A073145(n)^2.at n=19A073702
• G.f.: -(2+7*x-x^3)/(1+4*x-4*x^3-x^4).at n=11A097949
• Squares of the form prime(k)*prime(k+1) + 2*prime(k+1).at n=25A108604
• Squares k such that, if k has d digits, k has at least one digit in common with every other d-digit square.at n=17A173943
• Squares in A111153.at n=30A175255
• Prime powers p^k with even exponents k > 0 such that (1 + p^k)/2 is prime.at n=29A192618
• Number of 4Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 0 and 0 1 1 vertically.at n=7A207909
• Number of subsets of {1,2,...,n-8} without differences equal to 2, 4, 6 or 8.at n=50A224811
• Number A(n,k) of tilings of a k X k X n box using k*n bricks of shape k X 1 X 1; square array A(n,k), n>=0, k>=1, read by antidiagonals.at n=76A233308
• Squares which have one or more occurrences of exactly six different digits.at n=31A235721
• Square numbers in A070552.at n=22A263951
• Odd squares not of the form p + 2^k with p prime.at n=6A276567
• Composite numbers k such that tau(k^(k-1)) is a prime.at n=43A283549
• Number of perfect matchings in the graph P_2 X P_10 X P_n.at n=2A287054