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A074991
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Concatenation of n, n+1, n+2 divided by 3.
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20
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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; internal format)
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OFFSET
| 0,1
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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 increse 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.
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EXAMPLE
| a(4) = 456/3 = 152.
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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
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MATHEMATICA
| f[n_] := FromDigits@ Flatten@ IntegerDigits[{n, n + 1, n + 2}]/3; Array[f, 26, 0] (* RGWv *)
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CROSSREFS
| Cf. A074992.
Equals (1/3) A001703.
Sequence in context: A059918 A002677 A119527 * A068169 A069631 A069616
Adjacent sequences: A074988 A074989 A074990 * A074992 A074993 A074994
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 31 2002
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