27064

Appears in sequences

• Numbers having four 1's in base 9.at n=35A043460
• Numbers n such that 279*2^n-1 is prime.at n=26A050898
• a(n) = n*(n - 1)*(2*n^2 + n + 2)/6.at n=17A071246
• Numbers which are the sum of two positive cubes and divisible by 17.at n=21A099178
• T(n, k) = 3*T(n-1, k-1) + T(n-1, k) for k < n and T(n, n) = 1, T(n, k) = 0, if k < 0 or k > n; triangle read by rows.at n=51A119673
• Triangle read by rows: T(n,k) is the number of 2-compositions of n having k columns with only nonzero entries (0<=k<=floor(n/2)).at n=32A181307
• Number of 7-step one space at a time bishop's tours on an n X n board summed over all starting positions.at n=9A187160
• Triangular array: the fission of the polynomial sequence ((x+1)^n: n >= 0) by the polynomial sequence ((x+2)^n: n >= 0). (Fission is defined at Comments.)at n=42A193842
• Mirror image of the triangle A193842.at n=38A193843
• a(n) = Sum_{i=0..n} digsum_8(i)^3, where digsum_8(i) = A053829(i).at n=58A231682
• Triangle read by rows: T(n,k) is the coefficient A_k in the transformation Sum_{k=0..n} (k+1)*x^k = Sum_{k=0..n} A_k*(x-3)^k.at n=31A246799
• Numbers k such that k^2+1, (k+2)^2+1 and (k+6)^2+1 are prime.at n=42A302021
• Sum of the corners of a 2n+1 X 2n+1 square spiral.at n=40A325958
• Expansion of 1/((1-x) * (1-3*x)^3).at n=6A367591
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where T(n,k) = Sum_{j=0..n} k^j * binomial(j+k-1,j).at n=51A368487
• Number of integer partitions of n with a unique composite part.at n=49A379302