Primes consisting only of digits 4 and 7 occurring with equal frequency.
A087533
Primes consisting only of digits 4 and 7 occurring with equal frequency.
Terms
- a(0) =47a(1) =47447747a(2) =77474447a(3) =4447747747a(4) =4744477747a(5) =4744747477a(6) =4744747747a(7) =4747444777a(8) =4747747447a(9) =4774744477a(10) =4774747447a(11) =7444477477a(12) =7447474477a(13) =7744744747a(14) =7744747447a(15) =7747444477a(16) =7747447447a(17) =7747744447
External references
- oeis: A087533