22657

Appears in sequences

• a(n) = floor( a(n-1)/a(1) + a(n-3)/a(3) + a(n-5)/a(5) + ... ), for n >= 3 with a(1) = 1 and a(2) = 3.at n=36A022877
• a(n) = n-th prime number * n-th lucky number.at n=33A032601
• Numbers whose set of base-12 digits is {1,4}.at n=32A032824
• Semiprimes whose prime factors are of equal binary length and which differ from each other in exactly two bit positions.at n=46A261074
• Triangle read by rows: T(n,k) is the number of unlabeled connected multigraphs with n edges on k nodes, no cut-points and degree >= 3 at each node, loops allowed, n >= 2, 1 <= k <= floor(2*n/3).at n=53A360870
• Expansion of e.g.f. exp(4*(exp(x) - 1) - 3*x).at n=7A367921
• Expansion of g.f. A(x) satisfying Sum_{n>=0} Product_{k=1..n} (x^(2*k-1) + A(x)) = Product_{k>=1} (1 - x^(2*k)) * (1 + x^k + A(x))^2 / (1 + x^(2*k) + A(x))^2.at n=6A370344