44121

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 20.at n=20A031698
• Odd numbers with exactly 4 distinct palindromic prime factors.at n=20A046406
• a(n) = concatenation of n^2 and n.at n=20A055436
• a(n) = 100*n^2 + n.at n=20A055438
• Numbers k such that k and k^2 use only the digits 1, 2, 4, 6 and 9.at n=41A136995
• a(n) = 441*n^2 + 21.at n=10A158603
• Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 0 and 1 0 1 vertically.at n=4A207853
• Number of nX5 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 0 and 1 0 1 vertically.at n=4A207855
• T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 0 and 1 0 1 vertically.at n=40A207858
• Number of 5Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 0 and 1 0 1 vertically.at n=4A207860
• Number of n-tuples of singular vectors of a 3 X 3 X 3 X ... X 3 n-dimensional tensor.at n=4A274308
• Number of singular vector tuples for a general 5-dimensional n X n X n X n X n tensor.at n=2A283829
• Number A(n,k) of singular vector tuples for a general k-dimensional {n}^k tensor; square array A(n,k), n>=1, k>=1, read by antidiagonals.at n=23A284308
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1) + n - 1, where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4.at n=18A294367
• A(n,k) = Sum_{i_1=0..n} Sum_{i_2=0..n} ... Sum_{i_k=0..n} (-1)^(i_1 + i_2 + ... + i_k) * multinomial(i_1 + i_2 + ... + i_k; i_1, i_2, ..., i_k), square array A(n,k) read by antidiagonals, for n >= 0, k >= 0.at n=30A308322
• a(n) = Sum_{i=0..n} Sum_{j=0..n} Sum_{k=0..n} Sum_{l=0..n} Sum_{m=0..n} (-1)^(i+j+k+l+m) * (i+j+k+l+m)!/(i!*j!*k!*l!*m!).at n=2A308325
• a(n) = binomial(n, 2) + 6*binomial(n, 4).at n=22A327319