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

Offset: 1

Author

Paolo P. Lava, Mar 26 2012

Keywords

• nonn
• base

Comments

See A210415 for comments, links, and code.

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

Examples

			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.
		

Links

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

Crossrefs

Cf. A098670, A210414-A210423.