2138399

Properties

Appears in sequences

• Primes of the form 4*k-1 such that 8*k-1, 16*k-1, 32*k-1 and 64*k-1 are also primes.at n=19A101995
• Primes of the form 8*k-1 such that 4*k-1, 16*k-1, 32*k-1 and 64*k-1 are also primes.at n=10A101996
• a(n) = b_f(n) where f is the 2-periodic sequence f(k) = (-1)^k (see comments).at n=21A186265
• Prime numbersat n=158452