Number (> 0) of iterations of sigma (A000203) required to reach a multiple of n when starting with n.
A019294
Number (> 0) of iterations of sigma (A000203) required to reach a multiple of n when starting with n.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =2a(4) =5a(5) =1a(6) =5a(7) =2a(8) =7a(9) =4a(10) =15a(11) =3a(12) =13a(13) =3a(14) =2a(15) =2a(16) =13a(17) =4a(18) =12a(19) =5a(20) =2a(21) =13a(22) =16a(23) =2a(24) =17a(25) =4a(26) =9a(27) =1a(28) =78a(29) =7
External references
- oeis: A019294