63420

Appears in sequences

• Number of ways to place a non-attacking white and black king on n X n chessboard.at n=15A035286
• Length of A001388(n).at n=37A046639
• Numbers k such that k^6 + 1091 is prime.at n=32A066386
• Numbers k such that 4*k-1, 8*k-1, 16*k-1 and 32*k-1 are all primes.at n=27A101794
• Numbers n for which 2n-1, 4n-1, 8n-1, 16n-1 and 32n-1 are primes.at n=7A124017
• A recursion triangle sequence based on the Eulerian numbers: A(n,k)=n*A(n-1,k-1)+k*Eulerian(n-1,k).at n=31A157743
• Number of length-n 0..4 arrays with no repeated value equal to the previous repeated value.at n=6A269463
• T(n,k)=Number of length-n 0..k arrays with no repeated value equal to the previous repeated value.at n=51A269467
• Number of length-7 0..n arrays with no repeated value equal to the previous repeated value.at n=3A269471
• Expansion of e.g.f. exp(Sum_{i>=1} Sum_{j=1..i} x^(i*j) / (i*j)).at n=8A327927
• Numbers n for which 2 < A257993(A276086(A276086(n))) < A257993(n), where A276086 converts the primorial base expansion of n into its prime product form, and A257993 returns the index of the least prime not present in its argument.at n=42A328762