74111domain: NAppears in sequencesNumbers n such that 69*2^n-1 is prime.at n=59A050560Apply partial sum operator 5 times to partition numbers.at n=15A120477Number of distinct solutions of sum{i=1..3}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 1..n-1.at n=20A180785