a(n) is the minimal difference between two distinct n-digit numbers with property that when one of them is typed into a calculator and rotated 180 degrees, the other one is seen.
A125521
a(n) is the minimal difference between two distinct n-digit numbers with property that when one of them is typed into a calculator and rotated 180 degrees, the other one is seen.
Terms
- a(0) =3a(1) =6a(2) =30a(3) =60a(4) =300a(5) =600a(6) =3000a(7) =6000a(8) =30000a(9) =60000a(10) =300000a(11) =600000a(12) =3000000a(13) =6000000a(14) =30000000a(15) =60000000a(16) =300000000a(17) =600000000a(18) =3000000000a(19) =6000000000a(20) =30000000000a(21) =60000000000a(22) =300000000000a(23) =600000000000
External references
- oeis: A125521