702240

Appears in sequences

• G.f.: 1/((1-x^2)^3*(1-x)^4).at n=35A060099
• Numbers k such that phi(k) = sigma(core(k)) where phi(k) is the Euler totient function, sigma(k) the sum of divisors of k and core(k) the squarefree part of k (the smallest integer such that k*core(k) is a square).at n=29A069552
• Numbers that can be expressed as the difference of the squares of primes in exactly fourteen distinct ways.at n=3A092010
• Square array T(n, k) = Product_{j=1..n} p(j, k+1), p(n, x) = Sum_{j=0..n} (-1)^j*A053122(n, j)*x^j, and T(n, 0) = n!, read by antidiagonals.at n=60A156603
• Numbers n such that there exists a pair x,y, where x<y, x! = n and y! = n, that makes {x,y,n,n} an amicable multiset.at n=0A273969