55986

Appears in sequences

• a(n) = Sum_{k=1..n} n^k.at n=6A031972
• Numbers n such that sum of distinct primes dividing n is divisible by the largest prime dividing n. Also n has exactly 5 distinct prime factors and n is squarefree.at n=15A071144
• a(0)=0; a(n) = 6*a(n-1) + 6.at n=6A105281
• Numbers k such that k^2 divides 5^k-1.at n=36A127105
• Triangle by rows T(n,k), showing the number of meanders with length (n+1)*6 and containing (k+1)*6 Ls and (n-k)*6 Rs, where Ls and Rs denote arcs of equal length and a central angle of 60 degrees which are positively or negatively oriented.at n=26A197655
• a(n) = n^6 + n^5 + n^4 + n^3 + n^2 + n.at n=6A228290
• a(n) = A273059(4n).at n=42A275916
• Numbers k such that omega(k) = 5 and the largest prime factor of k equals the sum of its remaining distinct prime factors, where omega(k) = A001221(k).at n=38A383729
• a(n) is the number of 5 element sets of distinct integer-sided trapezoids each of area less than 3*n^2 whose base angles are 60 degrees that fill a regular hexagon of side n units.at n=43A390763