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A262578
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Concatenation of the numbers from 1 to n but omitting 8.
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0
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1, 12, 123, 1234, 12345, 123456, 1234567, 12345679, 1234567910, 123456791011, 12345679101112, 1234567910111213, 123456791011121314, 12345679101112131415, 1234567910111213141516, 123456791011121314151617, 12345679101112131415161718, 1234567910111213141516171819, 123456791011121314151617181920
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OFFSET
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1,2
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COMMENTS
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The first (probable) prime in this sequence is a(1872) = 1234567910111213...1873 (ending at 1873), a 6364-digit probable prime, too large to display here). It was found by David Broadhurst on Sep 27 2015.
No other primes through a(10000). - Robert Price, Nov 04 2018
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LINKS
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MATHEMATICA
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Module[{nn=30, c}, c=Drop[Range[nn], {8}]; Table[FromDigits[Flatten[IntegerDigits/@Take[c, n]]], {n, nn-1}]] (* Vincenzo Librandi, 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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