Consider the sum of the divisors of a number x>1. Take the sum of its digits. Repeat the process deleting the first addendum and adding the previous sum. The sequence lists the numbers that after some iterations reach x.
A269307
Consider the sum of the divisors of a number x>1. Take the sum of its digits. Repeat the process deleting the first addendum and adding the previous sum. The sequence lists the numbers that after some iterations reach x.
Terms
- a(0) =17a(1) =28a(2) =31a(3) =44a(4) =51a(5) =132a(6) =133a(7) =198a(8) =208a(9) =2528a(10) =9241a(11) =13570a(12) =16577a(13) =177568a(14) =228742a(15) =780889a(16) =878078a(17) =1854920a(18) =2775787a(19) =3663541a(20) =8204010a(21) =66326143a(22) =73734437a(23) =164211532a(24) =670396359a(25) =803230921a(26) =832581731a(27) =1036125551a(28) =1572413223
External references
- oeis: A269307