67795domain: NAppears in sequencesNumbers k such that 40*R_k + 7 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=11A056682Numbers n with following property: suppose n^6 = d1 d2 d3 ...dk in decimal; then d1! + d2! + ... + dk! is a square.at n=28A130688