71805domain: NAppears in sequencesLeast k such that decimal representation of k*n contains only digits 0 and 3.at n=45A096682Numbers k such that 4*k-1, 8*k-1, 16*k-1 and 32*k-1 are all primes.at n=29A101794Numbers n for which 2n-1, 4n-1, 8n-1, 16n-1 and 32n-1 are primes.at n=9A124017