50915

Appears in sequences

• Minimal number k such that (2k)^(2^n) + 1 is prime, but (2k)^(2^m) + 1 is composite for m < n.at n=14A122528
• a(n) is the smallest positive integer m such that 2^n appears as the denominator of a convergent to sqrt(m).at n=15A338308