74349domain: NAppears in sequencesNumbers k such that 30*R_k + 7 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=18A056680Number of nondecreasing -n..n vectors of length 6 whose dot product with some other -n..n vector equals 6.at n=7A226345Determinant of n X n Fibonacci word matrix.at n=25A370724