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Search: id:A131881
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| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 22, 24, 25, 26, 27, 28, 29, 30, 33, 35, 36, 37, 38, 39, 40, 44, 46, 47, 48, 49, 50, 55, 57, 58, 59, 60, 66, 68, 69, 70, 77, 79, 80, 88, 90, 100, 102, 103, 104, 105, 106, 107, 108, 109, 113, 114
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Numbers n that do not occur in the concatenation of 1,2,3...,n-1.
Every power of 10 is a member, which proves that the sequence is infinite. - njas, Jul 23 2007
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LINKS
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M. F. Hasler, Table of n, a(n) for n = 1..2428
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EXAMPLE
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The first number not in this sequence is the early bird "12" which occurs as concatenation of 1 and 2.
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PROGRAM
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(PHP) <?php $s="."; for(; ++$i < 2000; $s .= $i) if( !strpos($s, "$i")) echo $i, ", ";
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CROSSREFS
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Cf. A116700 (early birds).
Adjacent sequences: A131878 A131879 A131880 this_sequence A131882 A131883 A131884
Sequence in context: A023753 A035332 A048991 this_sequence A053460 A065200 A107909
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KEYWORD
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nonn,base
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AUTHOR
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M. F. Hasler (maximilian.hasler(AT)gmail.com), Jul 23 2007
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