a(n) is the least integer k such that 2^k - 1 has at least 10^n digits.
A227689
a(n) is the least integer k such that 2^k - 1 has at least 10^n digits.
Terms
- a(0) =1a(1) =30a(2) =329a(3) =3319a(4) =33216a(5) =332190a(6) =3321925a(7) =33219278a(8) =332192807a(9) =3321928092a(10) =33219280946a(11) =332192809486
External references
- oeis: A227689