22340

Appears in sequences

• Numbers n such that n^9+9 and n^9-9 are prime.at n=20A239505
• Number of unlabeled rooted trees with n nodes such that the minimal outdegree of inner nodes equals 6.at n=37A244460
• n*a(n+1) = (2*n^2+3*n+2)*a(n)-(n^2-n-2)*a(n-1); a(0)=1, a(1)=0.at n=6A259901
• Row sums of the array A274196, defined by g(n,k) = 1 for n >= 0; g(n,k) = 0 if k > n; g(n,k) = g(n-1,k-1) + g(n-1,4k) for n > 0, k > 1.at n=46A274197
• Number of 6-element subsets of [n] having a prime element sum.at n=17A320681
• Expansion of (-1 + Product_{k>=1} 1 / (1 - x^k))^4.at n=9A341222
• Numbers which are the sum of a prime and the square of the next prime.at n=33A349660
• Number of integer compositions of n whose leaders of strictly decreasing runs are identical.at n=32A374760