a(n) is the number of digits in the decimal representation of the smallest power of 7 that contains n consecutive identical digits.
A217189
a(n) is the number of digits in the decimal representation of the smallest power of 7 that contains n consecutive identical digits.
Terms
- a(0) =1a(1) =6a(2) =27a(3) =61a(4) =146a(5) =148a(6) =1658a(7) =5220a(8) =28595a(9) =51790
External references
- oeis: A217189