20952

Appears in sequences

• a(n) = least k such that 1+2+...+k >= E{1,2,...,n}, where E is the 3rd elementary symmetric function.at n=44A027917
• Numbers with at least two 3s in their prime signature.at n=50A109399
• a(n) = ((2+sqrt(3))*(3+sqrt(3))^n + (2-sqrt(3))*(3-sqrt(3))^n)/2.at n=6A162273
• Number of 3 X 3 semimagic squares with distinct positive values < n. In a semimagic squares the row and column sums must all be equal (the "magic sum").at n=6A173546
• Numbers of the form p^3*q^3*r where p, q, and r are prime.at n=32A179688
• T(n,k) is the number of n-step king-knight's tours (piece capable of both kinds of moves) on a k X k board summed over all starting positions.at n=31A187850
• Number of 4-step king-knight's tours (piece capable of both kinds of moves) on an n X n board summed over all starting positions.at n=4A187852
• sum(stirling1(n,k)*stirling1(n+1,k+1),k=0..n).at n=5A192547
• Numbers such that the largest prime factor equals the sum of the 4th power of the other prime factors.at n=15A244344
• Numbers k such that A307437(k) is divisible by 3.at n=38A342037
• a(n) = coefficient of 2^(2/3) in the expansion of (2^(1/3) + 2^(2/3))^n.at n=11A377119
• Expansion of 1 / ((1-x)^4 - x^7).at n=17A392545