218368

Appears in sequences

• Sum of the prime factors of k equals half the sum of the prime factors of k + 1.at n=36A074213
• a(n) = (5*4^n + (-2)^n)/6.at n=9A083424
• a(n) is the smallest number m such that n^2^k + m^2^k is prime for k=0,1,2,3 and 4.at n=2A090873
• E.g.f.: Product_{k>=1} (1 + x^(2*k-1)/(2*k-1)) / (1 - x^(2*k-1)/(2*k-1)).at n=8A326859
• a(n) = Sum_{k=0..floor(n/2)} 2^(n-k) * binomial(k,n-2*k)^2.at n=15A387483