Smallest palindrome beginning with n and digit sum n, or 0 if no such number exists.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =9a(9) =10801a(10) =11711a(11) =12621a(12) =13531a(13) =14441a(14) =15351a(15) =16261a(16) =17171a(17) =1881a(18) =0a(19) =208802a(20) =2139312a(21) =227722a(22) =2329232a(23) =246642a(24) =2519152a(25) =265562