A386039 Primes having only {0, 1, 7, 9} as digits.
7, 11, 17, 19, 71, 79, 97, 101, 107, 109, 179, 191, 197, 199, 701, 709, 719, 797, 907, 911, 919, 971, 977, 991, 997, 1009, 1019, 1091, 1097, 1109, 1117, 1171, 1709, 1777, 1901, 1907, 1979, 1997, 1999, 7001, 7019, 7079, 7109, 7177, 7717, 7901, 7907, 7919, 9001
Offset: 1