51530

Appears in sequences

• Numbers n such that 9*2^(2*n-1) - 1 is prime.at n=33A091996
• a(n) = Sum_{k=0..n} C(n+k,2k)*A000108(k)*3^k*2^(n-k).at n=5A152601
• Numbers k such that 4*10^k - 63 is prime.at n=25A279793
• Expansion of 1/( 1 - Sum_{k>=0} x^(4^k) / (1 - x^(4^k)) ).at n=16A382372