35070

Appears in sequences

• Triangle read by rows: T(n,k) = number of labeled digraphs with n nodes and k arcs and without directed paths of length >=2, with 0 <= k <= floor(n^2/4).at n=37A052296
• Numbers k > 1 such that, in base 6, k and k^2 contain the same digits in the same proportion.at n=21A061660
• Numbers k such that 2k+1, 4k+1, 6k+1 and 8k+1 are primes.at n=21A124409
• Numbers n that raised to the powers from 1 to k (with k>=1) are multiple of the sum of their digits (n raised to k+1 must not be a multiple). Case k=9.at n=30A135194
• Numbers n with property that n^2 is a sum of some 120 successive primes.at n=17A166262
• Euler transform of period 5 sequence [ 2, 1, 1, 2, 1, ...].at n=27A205183
• Triangle read by rows: T(n,k) (n>=1, k>=0) is the number of posets with n elements and rank k (or depth k+1).at n=40A263859
• Squarefree numbers n such that psi(phi(n)) = phi(psi(n) - n).at n=2A292048
• Expansion of ((eta(q)eta(q^3))/eta(q^2)^2)^2 in powers of q.at n=26A293389
• a(n) = Sum_{k=0..n} (-1)^k*binomial(n,k)^k.at n=6A295611
• Number of ordered pairs of length-n mutually overlapping binary strings.at n=7A295863