25714

Appears in sequences

• Numbers k such that usigma(k) = phi(k)*omega(k), where omega(k) is the number of distinct prime divisors of k.at n=17A063795
• Numbers k such that sigma(k) = bigomega(k) * phi(k).at n=12A067238
• Numbers k such that sigma(k) = 4*phi(k).at n=13A068390
• Numbers k such that sigma(k) = phi(k*bigomega(k)).at n=12A068400
• Numbers k such that sigma(k) = phi(k)*omega(k).at n=7A073567
• Squarefree balanced numbers (i.e., squarefree members of A020492).at n=41A078557
• Numbers such that Sigma(m)*UnitarySigma(m)= k*UnitaryPhi(m)^2, for some integer k.at n=47A122839
• a(n) = 14*n^2 - 4*n.at n=43A195023
• Number of (5+1) X (n+1) 0..1 arrays with every 2 X 2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.at n=13A258558
• Integers n such that sigma(n)/phi(n) is a perfect square.at n=26A293391
• Number of nonnegative solutions to (x_1)^2 + (x_2)^2 + ... + (x_7)^2 <= n.at n=33A341402
• Total sum of parts which are cubes in all partitions of n.at n=29A342229
• Irregular triangle read by rows: T(n,k) is the total number of parts in all partitions with k designated summands of all positive integers <= n, with n >= 1, 1 <= k <= A003056(n).at n=52A389679