123455

Appears in sequences

• Positive numbers k such that k and 4*k are anagrams in base 6 (written in base 6).at n=20A023066
• a(n) = min{p + q + r + ...} where p,q,r,... are distinct unary numbers - containing only ones, i.e., of the form (10^k - 1)/9 - formed by using a total of n ones.at n=19A110380