249847

Appears in sequences

• Integers n such that p = 4n + 1, q = 4p + 3, r = 4q + 5, s = 4r + 7 and t = 4s + 9 are all prime.at n=15A243528
• a(n) = floor(sqrt(Fibonacci(n+1)*Fibonacci(n))).at n=27A354210