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

Terms

a(0) =10111a(1) =1011001a(2) =1100101a(3) =10010101a(4) =10100011a(5) =101001001a(6) =1000001011a(7) =1000010101a(8) =1010000011a(9) =1100010001a(10) =10000001101a(11) =10001000011a(12) =10001001001a(13) =10001100001a(14) =10100000011a(15) =10100001001a(16) =11000000101a(17) =11001000001a(18) =11100000001a(19) =100000010101a(20) =100010001001a(21) =101000000011