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A141033
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Numbers that cannot be formed by the concatenation of previous terms.
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2
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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
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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COMMENTS
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Previous terms can appear in any order but can be used at most once. - Paolo P. Lava, Mar 04 2010
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LINKS
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EXAMPLE
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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.
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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