a(1) = 1; thereafter a(n) = a(n-1) / phi(n) if phi(n) divides a(n-1), otherwise a(n) = a(n-1) * phi(n), where phi is the Euler phi-function A000010.
A326889
a(1) = 1; thereafter a(n) = a(n-1) / phi(n) if phi(n) divides a(n-1), otherwise a(n) = a(n-1) * phi(n), where phi is the Euler phi-function A000010.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =1a(4) =4a(5) =2a(6) =12a(7) =3a(8) =18a(9) =72a(10) =720a(11) =180a(12) =15a(13) =90a(14) =720a(15) =90a(16) =1440a(17) =240a(18) =4320a(19) =540a(20) =45a(21) =450a(22) =9900a(23) =79200a(24) =3960a(25) =330a(26) =5940a(27) =495a(28) =13860a(29) =110880
External references
- oeis: A326889