A141033 Numbers that cannot be formed by the concatenation of previous terms.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 22, 33, 44, 55, 66, 77, 88, 99, 100, 101, 121, 131, 141, 151, 161, 171, 181, 191, 200, 202, 212, 232, 242, 252, 262, 272, 282, 292, 300, 303, 313, 323, 343, 353, 363, 373, 383, 393, 400, 404

Offset: 1

Author

Paolo P. Lava and Giorgio Balzarotti, Jul 30 2008, Aug 04 2008

Keywords

• nonn
• base

Comments

Previous terms can appear in any order but can be used at most once. - Paolo P. Lava, Mar 04 2010

Examples

			465 is not in the sequence because 4 U 6 U 5 -> 465;
466 is not in the sequence because 4 U 66 -> 466;
1313 is not in the sequence because 1 U 313 or 131 U 3 -> 1313.
		

Crossrefs

Cf. A141409.

Extensions

Corrected by Paolo P. Lava, Mar 03 2010