A210423 List the positions of all digits 9 in the concatenation of all terms, not necessarily in order. This is the lexicographically earliest such sequence.

2, 9, 4, 90, 7, 91, 92, 13, 93, 17, 94, 21, 95, 25, 96, 29, 97, 28, 35, 98, 39, 99, 38, 40, 47, 900, 52, 901, 57, 902, 62, 903, 67, 904, 72, 905, 77, 906, 82, 907, 87, 908, 999, 9999, 9990, 104, 909, 106, 113, 910, 119, 911, 118, 128, 912, 134, 913, 139, 143

Offset

1,1

Comments

See A210415 for comments, links, and code.

Links

Danny Rorabaugh, Table of n, a(n) for n = 1..1000

Example

The sequence cannot start with 1 because the first digit is not 9. Let us start with 2: the second digit is equal to 9. The third digit cannot be 3 because the third digit is not 9. So let it be 4. In the next position we now have 90 because it is the minimum number greater than 8 and starting with the digit 9. And so on.

Crossrefs

Cf. A210414, A210415, A210416, A210417, A210418, A210419, A210420, A210421, A210422.

Sequence in context: A268246 A268103 A127145 * A003725 A292952 A328619

Adjacent sequences: A210420 A210421 A210422 * A210424 A210425 A210426

Keyword

nonn,base

Author

Paolo P. Lava, Mar 26 2012

Extensions

a(23)-a(26) corrected by Paolo P. Lava, Apr 17 2012

Status

approved