31929

Appears in sequences

• G.f.: A(x) = x*cycle_index(S5, B(x)-1), where B(x) is g.f. for A000598.at n=18A036670
• Zeisel numbers.at n=10A051015
• a(n) = smallest number k such that three consecutive prime numbers prime(n), prime(n+1) and prime(n+2) are divisors of k, k+1 and k+2 respectively.at n=9A180095
• G.f.: (1+x^4)/(1-x-x^8).at n=52A193942
• Number of (n+2) X 8 0..3 arrays with every 3 X 3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly three ways, and new values 0..3 introduced in row major order.at n=7A204640
• Number of Dyck n-paths all of whose ascents and descents have prime lengths.at n=20A210735
• Number of unrooted binary unordered tanglegrams of size n.at n=8A259116
• Sum of quadratic residues of (n-th prime == 3 mod 4).at n=37A282035
• Let p = n-th prime == 7 mod 8; a(n) = sum of quadratic residues mod p.at n=18A282041
• Numbers k such that k^5*2^k + 1 is a prime.at n=11A367421
• Coefficient of x^n in the expansion of ( (1+x) * (1+x+x^2)^3 )^n.at n=5A370171