173166

Appears in sequences

• Triangular numbers that are repdigits with length > 2 in some base.at n=36A274084
• Number of compositions of 7*n-4 into parts 6 and 7.at n=18A373936
• a(n) = Sum_{k=0..floor(n/2)} binomial(k,3*(n-2*k)).at n=43A392253