1001220

Appears in sequences

• Positive numbers k such that k and 2*k are anagrams of each other in base 3 (k is written here in base 3).at n=20A023058
• a(n) = Sum_{d|6} phi(d)*n^(6/d).at n=10A054605
• a(n) = Sum_{d|n} phi(d)*10^(n/d).at n=6A054617