38675

Appears in sequences

• Number of permutations of length 2n satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..2n, with k=3, r=3, I={-2,0,1,2}. There is no one such permutation of length 2n+1.at n=18A079980
• Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=3, r=3, I={-2,0,1,2}.at n=36A079981
• a(n) = 7*A000330(n).at n=25A169607
• Numbers n such that sigma(sigma(phi(n))) = sigma(sigma(n)).at n=40A172466
• Least k with precisely n partitions k = x + y satisfying sigma(k) = sigma(x) + sigma(y).at n=20A211224
• Expansion of (1 - 2*x^2)/(1 + x)^5. Fourth column of Riordan triangle A248156.at n=33A248160
• a(n) = n*(n + 11)*(n + 22)*(n + 33)/24.at n=17A264448
• a(n) = (Product_{i=0..4}(i*n+2) - Product_{i=0..4}(-i*n-1))/(4*n+3).at n=12A274119
• Numbers n such that n and n+1 both have 24 divisors.at n=18A274362
• Occurrences of decrease of the probability density P(n) of coprime numbers k,m, satisfying 1 <= k <= a(n) and 1 <= m <= a(n), and a(n) congruent to 1 (mod 2) and a(n) not congruent to 3 (mod 6).at n=14A280879
• Numbers k such that k and k+1 both have the prime signature (2,1,1,1) (A189982).at n=7A336658
• Numbers that are the sum of six fourth powers in exactly five ways.at n=34A345817
• G.f. A(x) satisfies: A(x) = 1 / ((1 + x) * (1 - x * A(x)^7)).at n=7A349303