a(n) is the smallest nonnegative number k such that the decimal expansion of 2^k contains the string n.
A030000
a(n) is the smallest nonnegative number k such that the decimal expansion of 2^k contains the string n.
Terms
- a(0) =10a(1) =0a(2) =1a(3) =5a(4) =2a(5) =8a(6) =4a(7) =15a(8) =3a(9) =12a(10) =10a(11) =40a(12) =7a(13) =17a(14) =18a(15) =21a(16) =4a(17) =27a(18) =30a(19) =13a(20) =11a(21) =18a(22) =43a(23) =41a(24) =10a(25) =8a(26) =18a(27) =15a(28) =7a(29) =32
External references
- oeis: A030000