Numbers n such that phi(n) + sigma(n) is the mean value of phi(sigma(n)) and sigma(phi(n)).

A230237

Numbers n such that phi(n) + sigma(n) is the mean value of phi(sigma(n)) and sigma(phi(n)).

Terms

    a(0) =46427a(1) =66929a(2) =1560793a(3) =1796647a(4) =1810601a(5) =1839673a(6) =2053781a(7) =2176673a(8) =2426063a(9) =2467007a(10) =3172013a(11) =3898603a(12) =4208939a(13) =12011921a(14) =19504309a(15) =29241797a(16) =35464241a(17) =35501573a(18) =46838431a(19) =46976227a(20) =66580381a(21) =69406561a(22) =88015273a(23) =104722321

External references