26656

Appears in sequences

• Numbers k such that 2^prime(k) - 1 + 10^k is prime.at n=12A114056
• Number of intersections of at least four edges in a cube of n X n X n smaller cubes.at n=28A126562
• Eigentriangle of A001263: T(n,k) = A001263(n+1,k+1)*A102812(k).at n=33A143778
• Minimal covering numbers.at n=20A160559
• Expansion of x*(1-x)^2/( (1-2*x^2)*(1-2*x)^2).at n=12A178945
• O.g.f.: Sum_{n>=0} 2*n^n * (3*n+2)^(n-1) * exp(-n*(3*n+2)*x) * x^n / n!.at n=4A217912
• Number of s in {1,...,n}^n having shortest run with the same value of length 5.at n=12A228631
• Numbers n such that n!3 - 3^5 is prime.at n=33A247465
• Number of symmetric primitive Lucas strings of length n.at n=27A250112
• Number of 2 X 2 matrices with entries in {0,1,...,n} and even determinant with no entry repeated.at n=15A277044
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 270", based on the 5-celled von Neumann neighborhood.at n=14A280465
• Numbers k such that uphi(k)*usigma(k) = uphi(k+1)*usigma(k+1), where uphi is the unitary totient function (A047994) and usigma the sum of unitary divisors (A034448).at n=15A297365
• a(n) = 34*n^2.at n=28A303302
• a(n) = [x^n] ((1 - x)*x)/((1 - 2*x)^2*(2*x^2 - 2*x + 1)).at n=12A321959