Obtain m by omitting trailing zeros from n; a(n) = smallest multiple k*m which is a palindrome with even digits, or -1 if no such multiple exists.
A061915
Obtain m by omitting trailing zeros from n; a(n) = smallest multiple k*m which is a palindrome with even digits, or -1 if no such multiple exists.
Terms
- a(0) =0a(1) =2a(2) =2a(3) =6a(4) =4a(5) =-1a(6) =6a(7) =686a(8) =8a(9) =666a(10) =2a(11) =22a(12) =444a(13) =2002a(14) =686a(15) =-1a(16) =464a(17) =646a(18) =666a(19) =646a(20) =2a(21) =6006a(22) =22a(23) =828a(24) =888a(25) =-1a(26) =2002a(27) =8886888a(28) =868a(29) =464
External references
- oeis: A061915