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A262575
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Concatenation of the numbers from 1 to n but omitting 5.
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2
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1, 12, 123, 1234, 12346, 123467, 1234678, 12346789, 1234678910, 123467891011, 12346789101112, 1234678910111213, 123467891011121314, 12346789101112131415, 1234678910111213141516, 123467891011121314151617, 12346789101112131415161718, 1234678910111213141516171819, 123467891011121314151617181920
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OFFSET
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1,2
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COMMENTS
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The only primes among the first 98 terms are 123467891011 and 123467891011121314151617. See A262552 for further primes in this sequence.
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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], {5}]]]], {n, 20}]] (* Robert Price, Nov 05 2018 *)
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CROSSREFS
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Cf. A007908, A262299, A262571-A262582.
See A262300 for more about this problem.
For primes see A262552.
Sequence in context: A262577 A132943 A262576 * A187871 A187869 A262574
Adjacent sequences: A262572 A262573 A262574 * A262576 A262577 A262578
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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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