75311

Appears in sequences

• n written in fractional base 9/7.at n=37A024655
• Numbers k such that sigma(phi(k))-phi(sigma(k)) is nonzero and is divisible by (k+1), that is A065395(k)/(k+1) = (phi(sigma(k))-sigma(phi(k)))/(k+1) is a nonzero integer.at n=15A092586
• Number of zero-sum -n..n arrays of 4 elements with adjacent element differences also in -n..n.at n=33A202254