a(n) = denominator of fraction a/b, where gcd(a, b) = 1, whose decimal representation has the form 0.(1)(2)(3)...(n-1)(n)... with period (1)(2)(3)...(n-1)(n).
A172498
a(n) = denominator of fraction a/b, where gcd(a, b) = 1, whose decimal representation has the form 0.(1)(2)(3)...(n-1)(n)... with period (1)(2)(3)...(n-1)(n).
Terms
- a(0) =9a(1) =33a(2) =333a(3) =9999a(4) =33333a(5) =333333a(6) =9999999a(7) =11111111a(8) =111111111a(9) =99999999999
External references
- oeis: A172498