186231

Appears in sequences

• Numbers k such that sigma(phi(k)) = sigma(k) where sigma is the sum of divisors function A000203 and phi is the Euler totient function A000010.at n=32A033631
• Numbers k such that sigma(k*phi(k)) = sigma(k)^2.at n=9A082955
• Coefficient of x^n in the expansion of ( (1+x)^3 + x^2 )^n.at n=7A370286