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 A262575 Concatenation of the numbers from 1 to n but omitting 5. 2
 1, 12, 123, 1234, 12346, 123467, 1234678, 12346789, 1234678910, 123467891011, 12346789101112, 1234678910111213, 123467891011121314, 12346789101112131415, 1234678910111213141516, 123467891011121314151617, 12346789101112131415161718, 1234678910111213141516171819, 123467891011121314151617181920 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The only primes among the first 98 terms are 123467891011 and 123467891011121314151617. See A262552 for further primes in this sequence. LINKS MATHEMATICA DeleteDuplicates[Table[FromDigits[Flatten[IntegerDigits[Complement[Range[n], {5}]]]], {n, 20}]] (* Robert Price, Nov 05 2018 *) CROSSREFS 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 KEYWORD nonn,base AUTHOR N. J. A. Sloane, Sep 25 2015 STATUS approved

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Last modified April 16 17:01 EDT 2021. Contains 343050 sequences. (Running on oeis4.)