58748domain: NAppears in sequencesNumbers n such that 269*2^n-1 is prime.at n=6A050893a(n) = (a(n-1) + a(n-3))/gcd(a(n-1), a(n-3)) with a(0) =2, a(1) = 3, a(2) = 5.at n=61A214331Numbers k such that (754*10^k - 7)/9 is prime.at n=24A294634