64911

Appears in sequences

• Primitive elements of A065607.at n=25A120692
• Monotonic ordering of nonnegative differences 4^i-5^j, for 40>= i>=0, j>=0.at n=31A192161
• Number of Proth primes < 2^n.at n=37A214120
• a(n) gives the odd leg of the second of the two Pythagorean triangles with hypotenuse A080109(n) = A002144(n)^2. This is the larger of the two possible odd legs.at n=27A253804
• a(n) = 3*p(n), where p(n) is the number of partitions of n.at n=37A299473
• a(n) = Sum_{k=0..n} binomial(n,k) * binomial(n+2*k,k).at n=6A388533