Smallest n-digit prime containing only the digits 4 and 7, or 0 if no such prime exists.
A036944
Smallest n-digit prime containing only the digits 4 and 7, or 0 if no such prime exists.
Terms
- a(0) =7a(1) =47a(2) =0a(3) =4447a(4) =44777a(5) =0a(6) =4444747a(7) =44447747a(8) =0a(9) =4444444447a(10) =44444444747a(11) =0a(14) =0a(17) =0a(20) =0a(23) =0
External references
- oeis: A036944