This site is supported by donations to The OEIS Foundation. Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A067251 Numbers with no trailing zeros in decimal representation. 21
 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24, 25, 26, 27, 28, 29, 31, 32, 33, 34, 35, 36, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 48, 49, 51, 52, 53, 54, 55, 56, 57, 58, 59, 61, 62, 63, 64, 65, 66, 67, 68, 69, 71, 72, 73, 74, 75, 76, 77, 78, 79, 81, 82, 83, 84, 85, 86, 87, 88, 89, 91, 92, 93, 94, 95, 96, 97, 98, 99, 101, 102, 103, 104 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Or, decimated numbers: every 10th number has been omitted from the natural numbers. - Cino Hilliard, Feb 21 2005. For example, The 10th number starting with 1 is 10 and is missing from the table because it was decimated. The word "decimated" can be interpreted in several ways and should be used with caution. - N. J. A. Sloane, Feb 21 2005 a(n) mod 10 > 0 for all n. Not the same as A052382, as 101 is included. A004086(A004086(a(n)) = a(n). Numbers in here but not in A043095 are 81, 91, 92, 93, 94,... for example. - R. J. Mathar, Sep 30 2008 Complement of A008592; A168184(a(n)) = 1. - Reinhard Zumkeller, Nov 30 2009 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,0,0,0,0,1,-1). FORMULA a(n) = n + floor((n-1)/9). From Colin Barker, Sep 28 2015: (Start) a(n) = a(n-1) + a(n-9) - a(n-10) for n>10. G.f.: x*(x+1)*(x^4-x^3+x^2-x+1)*(x^4+x^3+x^2+x+1) / ((x-1)^2*(x^2+x+1)*(x^6+x^3+1)). (End) MATHEMATICA DeleteCases[Range, _?(Divisible[#, 10]&)] (* Harvey P. Dale, May 16 2016 *) PROG (PARI) f(n) = for(x=1, n, if(x%10, print1(x", "))) - Cino Hilliard, Feb 21 2005 (PARI) Vec(x*(x+1)*(x^4-x^3+x^2-x+1)*(x^4+x^3+x^2+x+1)/((x-1)^2*(x^2+x+1)*(x^6+x^3+1)) + O(x^100)) \\ Colin Barker, Sep 28 2015 (Haskell) a067251 n = a067251_list !! (n-1) a067251_list = filter ((> 0) . flip mod 10) [0..] -- Reinhard Zumkeller, Jul 11 2015, Dec 29 2011 CROSSREFS Cf. A076641 (reversed). Cf. A004086, A008592, A043095, A052382, A168184. Sequence in context: A043095 A023804 A209931 * A052382 A055572 A052040 Adjacent sequences:  A067248 A067249 A067250 * A067252 A067253 A067254 KEYWORD nonn,base,easy AUTHOR Reinhard Zumkeller, Mar 10 2002 EXTENSIONS Edited by N. J. A. Sloane, Sep 06 2008 at the suggestion of R. J. Mathar Typos corrected in a comment line by Reinhard Zumkeller, Apr 04 2010 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified November 19 20:42 EST 2019. Contains 329323 sequences. (Running on oeis4.)