n is odd and sum of digits of n equals the numbers of divisors of n.

Terms

a(0) =1a(1) =11a(2) =101a(3) =225a(4) =301a(5) =441a(6) =525a(7) =1003a(8) =1111a(9) =1425a(10) =1521a(11) =1575a(12) =1911a(13) =2015a(14) =2101a(15) =2325a(16) =2475a(17) =2541a(18) =2601a(19) =2925a(20) =3225a(21) =3311a(22) =3825a(23) =4275a(24) =4301a(25) =4851a(26) =5025a(27) =5175a(28) =5445a(29) =5733