22638

Appears in sequences

• Smallest number m such that when A051953 is applied n times to m the result is neither a power of 2 nor 0.at n=17A053476
• a(n) = floor( n^e ), e = 2.718281828...at n=39A061293
• Triangle T(n,k) (n >= 2, 2 <= k <= n-1 if n > 2) giving number of non-crossing trees with n nodes and k endpoints.at n=43A072247
• Numbers n such that A001414(n) = sum of composites from the smallest prime factor of n to the largest prime factor of n.at n=10A074053
• Seventh column of triangle A075502.at n=2A076002
• a(n) = (n+1)(n+2)^3*(n+3)(n+4)(5n^2 + 16n + 15)/1440.at n=5A108670
• Number of 3-step one space leftwards or up, two space rightwards or down asymmetric rook's tours on an n X n board summed over all starting positions.at n=38A187298
• Number of (w,x,y,z) with all terms in {1,...,n} and w<2x and y<=2z.at n=14A212507
• a(n) = n*prime(prime(n)) - prime(n)^2.at n=52A230098
• Numbers n for which there exists k < n such that A000203(k) = A000203(n) and A007947(k) = A007947(n), where A000203 gives the sum of divisors, and A007947 gives the squarefree kernel of n.at n=2A255335
• The least number k > A255334(n) for which A000203(k) = A000203(A255334(n)) and A007947(k) = A007947(A255334(n)), where A000203 gives the sum of divisors, and A007947 gives the squarefree kernel of n.at n=2A255423
• Numbers n such that for some m, A166133(m)=n, A166133(m+1)=n^2-1, in increasing order.at n=38A256407
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 137", based on the 5-celled von Neumann neighborhood.at n=34A270276
• Numbers n such that n^1024 + (n+1)^1024 is prime.at n=39A274234
• a(n) = (sqrt(7)*csc(Pi/7)/2)^n + (-sqrt(7)*csc(2*Pi/7)/2)^n + (-sqrt(7)*csc(4*Pi/7)/2)^n.at n=9A275831
• a(n) = prime(n) + prime(n+1) * prime(n+2).at n=33A293206
• Number of blunt polytans (polyaboloes) with n cells, identifying mirror images. A blunt polytan is one with no acute corners.at n=14A305606
• Expansion of 1/2 * (((1 + 2*x)/(1 - 2*x))^(3/2) - 1).at n=12A305612
• Indices of the primes of |A007442|.at n=22A359629