126360

Appears in sequences

• Number of ternary squarefree necklaces.at n=45A066297
• Numbers k such that the harmonic mean of the divisors of k is the square of a rational number.at n=19A074266
• Numbers k such that sigma(k)*phi(k)*k is a square.at n=13A114079
• Smallest k > 1 such that (sum of digits of k^n)*(sum of digits of k^(n+1)) = k, or 0 if no such k exists.at n=17A126783
• a(n) = n*(2*n^2 + 5*n + 3).at n=39A163815
• Numbers with prime factorization pqr^3s^5.at n=15A190475
• Square array A(n,k), n>=1, k>=1, read by antidiagonals: A(n,k) is the number of n-colorings of the square diagonal grid graph DG_(k,k).at n=33A212209
• a(n) = Sum_{0 < x,y,z <= n and gcd(x^2 + y^2 + z^2, n)=1} gcd(x^2 + y^2 + z^2 - 1, n).at n=38A239612