a(n) = smallest exponent k such that the string "1 2 ... n" appears in the decimal expansion of 2^k.
A171768
a(n) = smallest exponent k such that the string "1 2 ... n" appears in the decimal expansion of 2^k.
Terms
- a(0) =0a(1) =7a(2) =81a(3) =283a(4) =684a(5) =1318a(6) =8792a(7) =15975a(8) =61274a(9) =314072a(10) =4057579
External references
- oeis: A171768