a(n) contains n digits (either '2' or '5') and is divisible by 2^n.
A053317
a(n) contains n digits (either '2' or '5') and is divisible by 2^n.
Terms
- a(0) =2a(1) =52a(2) =552a(3) =5552a(4) =55552a(5) =255552a(6) =5255552a(7) =55255552a(8) =255255552a(9) =2255255552a(10) =22255255552a(11) =222255255552
External references
- oeis: A053317