1053481

Appears in sequences

• Numbers k such that 3^8*2^k - 1 is prime.at n=25A212311
• a(n) = coefficient of x^(2*n)/(2*n)! in the expansion of the even function C(x) = sqrt(1 + S(x)^2) where S(x) is defined by A357230.at n=5A357231