A210420 List the positions of all digits 6 in the concatenation of all terms, not necessarily in order. This is the lexicographically earliest such sequence.

2, 6, 4, 60, 61, 9, 62, 13, 63, 16, 19, 64, 23, 65, 26, 29, 66, 30, 35, 67, 39, 68, 43, 69, 46, 49, 600, 54, 601, 59, 666, 6666, 66660, 73, 602, 78, 603, 83, 604, 88, 605, 93, 606, 95, 101, 607, 106, 110, 608, 116, 609, 115, 125, 610, 131, 611, 136, 140, 612

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 6. Let us start with 2: the second digit is equal to 6. The third digit cannot be 3 because the third digit is not 6. So let it be 4. In the next position we now have 60 because it is the minimum number greater than 6 and starting with the digit 6. And so on.

Crossrefs

Cf. A210414, A210415, A210416, A210417, A210418, A210419, A210421, A210422, A210423.

Sequence in context: A080499 A072513 A022404 * A306585 A118138 A240023

Adjacent sequences: A210417 A210418 A210419 * A210421 A210422 A210423

Keyword

nonn,base

Author

Paolo P. Lava, Mar 26 2012

Status

approved