a(n) is the number of terms in the analog of A121805 but starting with n, or -1 if that sequence is infinite.
A330128
a(n) is the number of terms in the analog of A121805 but starting with n, or -1 if that sequence is infinite.
Terms
- a(0) =2137453a(2) =2a(3) =199900a(4) =19706a(6) =15a(7) =198104936410a(8) =19511030a(9) =20573a(10) =20572a(11) =2137452a(12) =20534a(13) =19238a(14) =2a(15) =2089707a(16) =20670629294a(17) =1a(18) =21482a(20) =2074a(22) =20571a(24) =193a(25) =197062a(26) =1a(27) =197a(28) =2061823
External references
- oeis: A330128