a(n) is the least number k whose sum of digits in base 10 is n and that is palindromic in base n, or -1 if no such number exists.

A375387

a(n) is the least number k whose sum of digits in base 10 is n and that is palindromic in base n, or -1 if no such number exists.

Terms

    a(0) =-1a(1) =130a(2) =41a(3) =123a(4) =16a(5) =170a(6) =-1a(7) =55a(8) =155a(9) =39a(10) =274a(11) =239a(12) =96a(13) =187a(14) =494a(15) =2925a(16) =685a(17) =1784a(18) =1389a(19) =859a(20) =599a(21) =1779a(22) =1978a(23) =989a(24) =6597a(25) =5887a(26) =6968a(27) =8499a(28) =5989a(29) =17969

External references