325889

Properties

Appears in sequences

• a(n) = smallest prime number p_k such that 1/p_n + 1/p_{n+1} + ... + 1/p_k > 1.at n=25A119494
• 1/4 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 25.at n=14A159225
• a(n) = Sum_{k=1..n} 2^(n - floor(n/k)).at n=15A345108
• Prime numbersat n=28081