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A262580
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Concatenation of the numbers from 1 to n but omitting 10.
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0
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1, 12, 123, 1234, 12345, 123456, 1234567, 12345678, 123456789, 12345678911, 1234567891112, 123456789111213, 12345678911121314, 1234567891112131415, 123456789111213141516, 12345678911121314151617, 1234567891112131415161718, 123456789111213141516171819, 12345678911121314151617181920
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OFFSET
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1,2
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COMMENTS
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The smallest prime in this sequence is the 61457-digit (probable) prime a(14512) = 123456789111213...14513 found by David Broadhurst on Sep 28 2015.
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LINKS
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MATHEMATICA
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DeleteDuplicates[Table[FromDigits[Flatten[IntegerDigits[Complement[Range[n], {10}]]]], {n, 20}]] (* Robert Price, Nov 05 2018 *)
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CROSSREFS
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See A262300 for more about this problem.
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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