Infinite square array, where row r >= 0 is the orbit of r under the map A380873: concatenate(sum of digits, product of digits).
A380872
Infinite square array, where row r >= 0 is the orbit of r under the map A380873: concatenate(sum of digits, product of digits).
Terms
- a(0) =0a(1) =0a(2) =1a(3) =0a(4) =11a(5) =2a(6) =0a(7) =21a(8) =22a(9) =3a(10) =0a(11) =32a(12) =44a(13) =33a(14) =4a(15) =0a(16) =56a(17) =816a(18) =69a(19) =44a(20) =5a(21) =0a(22) =1130a(23) =1548a(24) =1554a(25) =816a(26) =55a(27) =6a(28) =0a(29) =50
External references
- oeis: A380872