629856

Appears in sequences

• Denominator of sum of -5th powers of divisors of n.at n=17A017674
• Numbers of form 6^i*9^j, with i, j >= 0.at n=30A025628
• a(n) = Sum_{k=0..m} (k+1) * A026082(n, k), where 0 <= k <= m, m=n for n=0,1,2,3; m=2n for n >= 4.at n=11A027319
• Duplicate of A027319.at n=11A027320
• a(n) = A003474(n)/n.at n=14A094678
• Numbers n such that (phi(n) + sigma(n))/(rad(n))^2 is an integer > 1 (phi=A000010, sigma=A000203, rad=A007947).at n=11A097982
• Numbers k such that (phi(k) + sigma(k))/rad(k)^2 is an integer, that is (phi(k) + sigma(k)) is divisible by every prime factor of k squared.at n=13A121850
• Numbers k that have measure of smoothness J larger than 7, where J = log(k)/log(rad(k)) and rad(k) is the product of the distinct prime divisors of k (A007947).at n=30A172422
• Numbers k such that rad(k)^2 divides sigma(k).at n=24A173615
• a(n) = floor(1/{(1+n^4)^(1/4)}), where {} = fractional part.at n=53A184536
• (n-1)-st elementary symmetric function of the first n terms of the periodic sequence (1,1,1,3,1,1,1,3,...).at n=37A203235
• Number of (n+1)X4 0..2 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order.at n=4A203979
• Number of (n+1) X 6 0..2 arrays with no 2 X 2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order.at n=2A203981
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order.at n=23A203984
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order.at n=25A203984
• Number of 2 X 2 matrices with all elements in {0,1,...,n} and odd determinant.at n=35A210370
• Maximal values of permanent on (0,1) square matrices of order n with row and column sums 3.at n=20A232553
• Number of solutions to gcd(x^2 + y^2 + z^2 + t^2 + h^2, n) = 1 with x,y,z,t,h in [0,n-1].at n=17A238533
• T(n,k)=Number of nXk 0..2 arrays with no element equal to any value at offset (0,-2) (-1,-2) or (-2,-1) and new values introduced in order 0..2.at n=43A275090
• T(n,k)=Number of nXk 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,1) or (-1,-2) and new values introduced in order 0..2.at n=37A275352