a(n) contains n digits (either '2' or '7') and is divisible by 2^n.
A053318
a(n) contains n digits (either '2' or '7') and is divisible by 2^n.
Terms
- a(0) =2a(1) =72a(2) =272a(3) =2272a(4) =22272a(5) =222272a(6) =7222272a(7) =27222272a(8) =727222272a(9) =2727222272a(10) =72727222272a(11) =772727222272
External references
- oeis: A053318