18909

Appears in sequences

• E.g.f.: tanh(log(1+x))*cos(x).at n=9A009776
• E.g.f. tanh(log(1+x))*cosh(x).at n=9A009777
• Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 17 (most significant digit on right).at n=16A029510
• Numbers n such that 259*2^n-1 is prime.at n=19A050888
• a(n) = a(n-1) + 2*n^2 with a(1) = 1.at n=29A112524
• Ascending sequence of numbers such that the sum of any two distinct elements (even + odd) is a prime number.at n=37A180743
• Number of n X 2 -1,1 arrays such that the sum over i=1..n, j=1..2 of i*x(i,j) is zero, the sum of x(i,j) is zero, and rows are nondecreasing (number of ways to distribute 2-across galley oarsmen left-right at n fore-aft positions so that there are no turning moments on the ship).at n=14A225338
• a(n) = Sum_{k=0..n} A059432(n,k).at n=6A341647