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A030299 Numbers whose digits are permutations of (1,2,3,4,...,i) for some i >= 1. +0
2
1, 12, 21, 123, 132, 213, 231, 312, 321, 1234, 1243, 1324, 1342, 1423, 1432, 2134, 2143, 2314, 2341, 2413, 2431, 3124, 3142, 3214, 3241, 3412, 3421, 4123, 4132, 4213, 4231, 4312, 4321, 12345, 12354, 12435, 12453, 12534, 12543, 13245, 13254, 13425 (list; graph; listen)
OFFSET

1,2

COMMENT

Permutations of lengths 1, 2, 3, ... arranged lexicographically.

After 987654321 we get 12345678910.

CROSSREFS

Cf. A055089, A060117.

Sequence in context: A111066 A044005 A134514 this_sequence A001292 A114015 A065439

Adjacent sequences: A030296 A030297 A030298 this_sequence A030300 A030301 A030302

KEYWORD

nonn,easy,base

AUTHOR

njas, Clark Kimberling (ck6(AT)evansville.edu)

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.


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