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A262576
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Concatenation of the numbers from 1 to n but omitting 6.
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0
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1, 12, 123, 1234, 12345, 123457, 1234578, 12345789, 1234578910, 123457891011, 12345789101112, 1234578910111213, 123457891011121314, 12345789101112131415, 1234578910111213141516, 123457891011121314151617, 12345789101112131415161718, 1234578910111213141516171819, 123457891011121314151617181920
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OFFSET
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1,2
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COMMENTS
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The only prime among the first 98 terms is a(6) = 123457. Does the sequence contain any other primes?
No additional primes through the first 2000 terms. - Harvey P. Dale, Sep 27 2018
Differs from A132943 at about the 28th terms.
No primes, other than a(6), through a(10000). - Robert Price, Nov 03 2018
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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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Module[{nn=20, c}, c=Drop[Range[nn], {6}]; Table[FromDigits[Flatten[ IntegerDigits/@ Take[c, n]]], {n, nn-1}]] (* Harvey P. Dale, Sep 27 2018 *)
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CROSSREFS
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Cf. A132943.
Cf. A007908, A262299, A262571-A262582.
See A262300 for more about this problem.
Sequence in context: A262578 A262577 A132943 * A262575 A187871 A187869
Adjacent sequences: A262573 A262574 A262575 * A262577 A262578 A262579
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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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