22013952

Appears in sequences

• Numbers n such that phi(n) + sigma(n) = 3n.at n=14A011251
• Nonprimes k that divide sigma(k) + phi(k).at n=19A011774
• Numbers of the form 2^(k+2)*3*(7*2^k-1) where 7*2^k-1 is prime.at n=2A112729