91855domain: NAppears in sequencesNumbers k such that 70*R_k + 1 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=14A056688Number of arrangements of 5 numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.at n=10A188360