Fixed points of the function a(n) = phi(sigma(n) - phi(n) - d(n)), where phi(n) is the Euler totient function, sigma(n) the sum of divisors of n and d(n) the number of divisors of n.
A243995
Fixed points of the function a(n) = phi(sigma(n) - phi(n) - d(n)), where phi(n) is the Euler totient function, sigma(n) the sum of divisors of n and d(n) the number of divisors of n.
Terms
- a(0) =1a(1) =18a(2) =96a(3) =560a(4) =720a(5) =1056a(6) =1760a(7) =2000a(8) =3264a(9) =7392a(10) =30960a(11) =50800a(12) =172080a(13) =173440a(14) =9561600a(15) =13304064a(16) =195522560a(17) =1017856448a(18) =1026021024a(19) =1568010240a(20) =2817884160
External references
- oeis: A243995