38830

Appears in sequences

• Number of nonempty subsets of {1,2,...,n} in which exactly 1/5 of the elements are <= n/2.at n=23A047165
• Number of nonempty subsets of {1,2,...,n} in which exactly 4/5 of the elements are <= n/2.at n=23A047168
• a(n) = Sum_{k=1..n} lcm(k,n)/gcd(k,n).at n=42A056789
• Sum of terms in row n of A081520.at n=42A081519
• Number of n-celled polyzebras with bilateral symmetry.at n=11A093991
• a(n) = floor(((sqrt(sqrt(3))^3)/sqrt(Pi))^n).at n=42A255575
• Least positive integer k such that prime(prime(k)), prime(prime(k*n)), prime(p) and prime(q) form a 4-term arithmetic progression for some pair of primes p and q.at n=25A261462
• Sum of first n Honaker primes.at n=21A276255
• Dirichlet convolution of the integer partition numbers A000041 with the number of divisors function A000005.at n=40A323766