Semi-one numbers: Positive integers k such that exactly half of the integers 1..k have a 1 in their decimal expansion.
A343839
Semi-one numbers: Positive integers k such that exactly half of the integers 1..k have a 1 in their decimal expansion.
Terms
- a(0) =2a(1) =16a(2) =24a(3) =160a(4) =270a(5) =272a(6) =1456a(7) =3398a(8) =3418a(9) =3420a(10) =3422a(11) =13120a(12) =44686a(13) =118096a(14) =674934a(15) =1062880
External references
- oeis: A343839