872960

Appears in sequences

• Triangle read by rows, expansion of exp(x*z)*z*(tanh(z) + sech(z)), T(n, k) for n >= 1 and 0 <= k <= n-1.at n=56A294033
• Numbers k such that A048675(sigma(k)) is equal to A048675(2*k).at n=24A331751
• Numbers x such that there exist two integers 0<x<=y and z>0 such that sigma(x)^2 = sigma(y)^2 = x^2 + y^2 + z^2.at n=17A385356