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A262572
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Concatenation of the numbers from 1 to n but omitting 2.
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3
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1, 13, 134, 1345, 13456, 134567, 1345678, 13456789, 1345678910, 134567891011, 13456789101112, 1345678910111213, 134567891011121314, 13456789101112131415, 1345678910111213141516, 134567891011121314151617, 13456789101112131415161718, 1345678910111213141516171819, 134567891011121314151617181920
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..19.
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MATHEMATICA
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DeleteDuplicates[Table[FromDigits[Flatten[IntegerDigits[Complement[Range[n], {2}]]]], {n, 20}]] (* Robert Price, Nov 05 2018 *)
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CROSSREFS
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For primes see A262298.
Cf. A007908, A262299, A262571-A262582.
See A262300 for more about this problem.
Sequence in context: A228277 A221153 A297335 * A132935 A132930 A130774
Adjacent sequences: A262569 A262570 A262571 * A262573 A262574 A262575
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KEYWORD
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nonn,base
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AUTHOR
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N. J. A. Sloane, Sep 25 2015
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STATUS
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approved
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