A210416 - OEIS

A210416

List the positions of all digits 2 in the concatenation of all terms, not necessarily in order. This is the lexicographically earliest such sequence.

2, 20, 1, 6, 21, 9, 22, 10, 15, 23, 19, 222, 220, 25, 27, 29, 32, 35, 200, 40, 201, 45, 202, 47, 52, 203, 51, 59, 204, 64, 205, 69, 206, 74, 207, 79, 208, 84, 209, 89, 210, 94, 211, 99, 212, 101, 108, 213, 114, 214, 120, 215, 118, 127, 132, 216, 131, 141, 217

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

See A210415 for comments, links, and code.

See A098670 for a variant with increasing terms. - M. F. Hasler, Oct 08 2013

LINKS

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

EXAMPLE

The sequence starts with 2: the second digit is equal to 2. In the second position we cannot write only 2 because the first number is already 2. So we use the minimum number greater than 2 and beginning with digit 2, i.e., 20. In the third position we can write 1 because the digit in the first position is 2. And so on.

CROSSREFS

Cf. A098670, A210414-A210423.

Sequence in context: A301637 A366333 A366331 * A351312 A220943 A082259

Adjacent sequences: A210413 A210414 A210415 * A210417 A210418 A210419

KEYWORD

nonn,base

AUTHOR

Paolo P. Lava, Mar 26 2012

STATUS

approved