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 A074991 Concatenation of n, n+1, n+2 divided by 3. 20
 4, 41, 78, 115, 152, 189, 226, 263, 2970, 30337, 33704, 37071, 40438, 43805, 47172, 50539, 53906, 57273, 60640, 64007, 67374, 70741, 74108, 77475, 80842, 84209, 87576, 90943, 94310, 97677, 101044, 104411, 107778, 111145, 114512 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS If all the three numbers have the same number of digits then the terms are in A.P. with a common difference that follows a pattern with increase in number of digits. E.g. for n = 1 to 7 the common difference, c.d. = 37. For n = 10 to 97 c.d. = 3367, For three digit numbers from 100 to 997 it is 333667 etc. LINKS EXAMPLE a(4) = 456/3 = 152. MAPLE read("transforms") ; A074991 := proc(n)         digcatL([n, n+1, n+2]) ;         %/3 ; end proc: seq(A074991(n), n=0..50) ; # R. J. Mathar, Oct 04 2011 MATHEMATICA f[n_] := FromDigits@ Flatten@ IntegerDigits[{n, n + 1, n + 2}]/3; Array[f, 26, 0] (* Robert G. Wilson v *) CROSSREFS Cf. A074992. Equals (1/3) A001703. Sequence in context: A296101 A002677 A119527 * A294972 A213823 A296800 Adjacent sequences:  A074988 A074989 A074990 * A074992 A074993 A074994 KEYWORD base,nonn AUTHOR Amarnath Murthy, Aug 31 2002 EXTENSIONS Incorrect conjecture deleted by Colin Barker, Sep 26 2013 STATUS approved

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Last modified July 20 11:28 EDT 2019. Contains 325180 sequences. (Running on oeis4.)