Numbers k such that phi(phi(k)) = sum of prime factors of k.
A075863
Numbers k such that phi(phi(k)) = sum of prime factors of k.
Terms
- a(0) =8a(1) =45a(2) =55a(3) =95a(4) =126a(5) =132a(6) =198a(7) =215a(8) =228a(9) =516a(10) =2855a(11) =6852a(12) =7655a(13) =18372a(14) =276455a(15) =663492
External references
- oeis: A075863