77697

Appears in sequences

• a(n) = number of primes of the form x^2 + 1 <= 2^n.at n=40A083847
• Number of primes of the form x^2 + 1 < 2^n.at n=40A174246
• a(n) = 6*a(n-1)-8*a(n-2) for n > 10; a(0)=221, a(1)=2754, a(2)=12456, a(3)=77697, a(4)=589869, a(5)=5333271, a(6)=48222198, a(7)=218509695, a(8)=3071851356, a(9)=12683673552, a(10)=51137150880.at n=3A177420