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 A030655 Pair up the numbers. 4
 12, 34, 56, 78, 910, 1112, 1314, 1516, 1718, 1920, 2122, 2324, 2526, 2728, 2930, 3132, 3334, 3536, 3738, 3940, 4142, 4344, 4546, 4748, 4950, 5152, 5354, 5556, 5758, 5960, 6162, 6364, 6566, 6768, 6970, 7172, 7374, 7576, 7778, 7980, 8182, 8384, 8586 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS That is, a(n) is the concatenation of 2n-1 and 2n. - Charles R Greathouse IV, Aug 07 2012 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 MATHEMATICA FromDigits[Flatten[IntegerDigits/@{#}]]&/@Partition[Range[90], 2] (* Harvey P. Dale, Sep 28 2011 *) PROG (Magma) [Seqint(Intseq(n+1) cat Intseq(n)): n in [1..86 by 2]]; // Bruno Berselli, Jun 18 2011 (PARI) a(n)=eval(concat(Str(2*n-1), 2*n)) \\ Charles R Greathouse IV, Jun 18, 2011 CROSSREFS Cf. A030656. Subsequence of A005843. Sequence in context: A141694 A228595 A077295 * A098080 A068517 A113748 Adjacent sequences: A030652 A030653 A030654 * A030656 A030657 A030658 KEYWORD base,nonn,easy,changed AUTHOR EXTENSIONS More terms from Erich Friedman. STATUS approved

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Last modified March 22 18:49 EDT 2023. Contains 361433 sequences. (Running on oeis4.)