944784

Appears in sequences

• Numbers of the form 4^i * 9^j, with i, j >= 0.at n=39A025620
• Numbers of form 6^i*9^j, with i, j >= 0.at n=31A025628
• Squares which are the sum of twin prime pairs.at n=23A037072
• Number of labeled trees with 3-colored nodes.at n=6A038062
• Nearest integer to n^6/36.at n=17A061004
• Squares k which are divisible by phi(k).at n=33A063755
• Numbers whose sum of non-unitary divisors is a prime and sets a new record for such primes.at n=30A063760
• 3-smooth numbers whose arithmetic derivatives are also 3-smooth.at n=37A085256
• Perfect powers which are the sum of twin prime pairs.at n=26A119767
• a(n) = if n mod 2 = 1 then n^3*(n-1)^2/2 else n^5/2.at n=18A122658
• Hankel transform of central coefficients of (1+k*x-3x^2)^n, k arbitrary integer.at n=4A127946
• a(n) = (n mod 2) if n <= 3, otherwise a(n) = (n^2-5n+7)*(n-2)*a(n-1)/(n-3) + (n^2-5n+7)*a(n-2) - (n-2)*a(n-3)/(n-3).at n=8A144656
• Totally multiplicative sequence with a(p) = 9*(p+1) for prime p.at n=35A166649
• One quarter the number of nX3 1..4 arrays with no two neighbors of any element equal to each other.at n=9A183355
• Number of 3Xn binary arrays without the pattern 0 1 diagonally or antidiagonally.at n=11A188825
• Number of compositions of even natural numbers into 5 parts <= n.at n=17A191484
• Number of compositions of odd positive integers into 5 parts <= n.at n=17A191902
• Number of (n+1)X2 0..3 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements.at n=4A203819
• Number of (n+1)X6 0..3 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements.at n=0A203823
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements.at n=10A203826