31720

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 89.at n=37A031587
• Numbers n such that 117*2^n-1 is prime.at n=46A050584
• Numbers k such that k+1, k+3, k+7 and k+9 are all primes.at n=22A125855
• G.f. A satisfies -x+(1+x^3-x)*A+(x^4-x^2)*A^2+(x^5-x^3)*A^3-x^4*A^4 = 0.at n=17A177794
• Number of 6-step S, NW and NE-moving king's tours on an n X n board summed over all starting positions.at n=15A187380
• Number of n X 6 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 1 1 and 1 1 1 vertically.at n=13A208778
• Sum of the largest parts in the partitions of n into 8 parts.at n=38A308998
• G.f.: Product_{k >= 0} ((1 + x^(2*k+1)) / (1 - x^(2*k+1)))^k.at n=34A361008
• G.f. A(x) satisfies A(x) = 1 + x*A(x)^2 / (1 - x*A(x)^5).at n=7A364740