75206

Appears in sequences

• Binomial transform of pentanacci numbers A074048: a(n)=Sum((-1)^k*Binomial(n,k)*A074048(k),(k=0,..,n)).at n=20A075194
• Expansion of (1 - x)/(1 - 3*x - 2*x^2 - 2*x^3).at n=9A077839
• Even composites in A145832 with at least three distinct prime factors.at n=26A145916
• a(n) = number of primes less than the square root of the (2^n)-th prime.at n=35A249058