a(n) is the smallest odd number m such that 2^n*m has n digits but has at most two distinct digits.
A124245
a(n) is the smallest odd number m such that 2^n*m has n digits but has at most two distinct digits.
Terms
- a(0) =1a(1) =3a(2) =25a(3) =101a(4) =363a(5) =3125a(6) =15625a(7) =71023a(8) =390625a(9) =1183713a(10) =5474669a(11) =27151397a(12) =135646011a(13) =1220703125a(14) =6103515625a(15) =18480090517a(16) =85533990571a(17) =762939453125
External references
- oeis: A124245