26586

Appears in sequences

• 10-gonal (or decagonal) pyramidal numbers: a(n) = n*(n + 1)*(8*n - 5)/6.at n=27A007585
• Numbers k such that phi(k) + phi(k+1) divides sigma(k) + sigma(k+1).at n=27A067282
• Number of base 26 n-digit numbers with adjacent digits differing by five or less.at n=4A126547
• Sums of 2 cubes of distinct odd primes.at n=32A137632
• Triangle read by rows: T(n,k) is the number of non-crossing connected graphs on n nodes on a circle in which the root (a distinguished node) has degree k (n >= 2, 1 <= k <= n-1).at n=22A143022
• A partition product of Stirling_1 type [parameter k = -6] with biggest-part statistic (triangle read by rows).at n=22A157386
• A partition product of Stirling_2 type [parameter k = -6] with biggest-part statistic (triangle read by rows).at n=22A157396
• Consider the base-8 Kaprekar map n->K(n) defined in A165090. Sequence gives numbers belonging to cycles, including fixed points.at n=16A165095
• Consider the base-8 Kaprekar map n->K(n) defined in A165090. Sequence gives numbers belonging to cycles of length greater than 1.at n=13A165097
• Numbers n such that 30n-13, 30n-11, 30n-1, 30n+1, 30n+11, 30n+13 are all prime.at n=15A175683
• a(n) = n*(n-3)*(n^2-7*n+14)/8.at n=21A176145
• Triangle T(n,r), read by rows, where the r-th column is expansion of A(x)^r, with A(x) = x * (x+1) * (2*x^4+4*x^3-2*x+1) * (x^4+2*x^3-x+1) / (x^2+x-1)^6.at n=50A187055
• Even, nonzero decagonal pyramidal numbers.at n=12A218331
• Smallest integer areas of integer-sided triangles where at least one side is of length prime(n).at n=46A229159
• Series reversion of x*(1-x-2*x^2)/(1-x).at n=11A235349
• Number of (5+1) X (n+1) 0..1 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.at n=10A250773
• Even numbers that are the sum of two odd prime cubes.at n=40A286836
• Triangular array read by rows: row n shows the coefficients of this polynomial of degree n: p(x,n) = ((x+r)^n - (x+s)^n)/(r - s), where r = 3 and s = 2.at n=40A327316
• Number of compositions (ordered partitions) of n into an even number of primes.at n=31A339408
• Number of alternating patterns of length n, including pairs (x,x).at n=8A344605