48904

Appears in sequences

• Number of solutions to c(1)*prime(2) + ... + c(2n-1)*prime(2n) = -1, where c(i) = +-1 for i > 1, c(1) = 1.at n=12A261062
• a(n) is the number of graceful graphs with n edges and round(sqrt(3n+9/4)) vertices.at n=25A343296
• Numbers k such that 3^(2*k+1) - 3^k - 1 is prime.at n=23A344170