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A084383 a(0)=0; for n>0, a(n) = smallest number that is not a concatenation of any number of distinct earlier terms in increasing order. 3
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 20, 21, 22, 30, 31, 32, 33, 40, 41, 42, 43, 44, 50, 51, 52, 53, 54, 55, 60, 61, 62, 63, 64, 65, 66, 70, 71, 72, 73, 74, 75, 76, 77, 80, 81, 82, 83, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

After 11 we can see 1,2 -> 12, 1,3 ->13, etc., but not 20.

LINKS

Table of n, a(n) for n=0..69.

CROSSREFS

Hannah Rollman's numbers: A048991, A048992.

Sequence in context: A247758 A247757 A247754 * A032873 A072543 A009996

Adjacent sequences:  A084380 A084381 A084382 * A084384 A084385 A084386

KEYWORD

nonn,base

AUTHOR

Amarnath Murthy, May 29 2003.

EXTENSIONS

More terms from Patrick De Geest, Jun 03 2003.

STATUS

approved

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Last modified June 24 17:50 EDT 2019. Contains 324330 sequences. (Running on oeis4.)