Primes made up of 0's and seven 1's only.

Terms

a(0) =11110111a(1) =11111101a(2) =101101111a(3) =101111011a(4) =110111011a(5) =111010111a(6) =1001110111a(7) =1010011111a(8) =1011110011a(9) =1100101111a(10) =1101010111a(11) =1101110011a(12) =1110011101a(13) =1110110011a(14) =1111100101a(15) =1111110001a(16) =10010110111a(17) =10011101011a(18) =10011110101a(19) =10100111101a(20) =10111001011a(21) =10111110001a(22) =11001011101