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 A116547 Permutation of natural numbers generated by 5-rowed array shown below. 1
 0, 5, 1, 10, 6, 2, 15, 11, 7, 3, 20, 16, 12, 8, 4, 25, 21, 17, 13, 9, 30, 26, 22, 18, 14, 35, 31, 27, 23, 19, 40, 36, 32, 28, 24, 45, 41, 37, 33, 29, 50, 46, 42, 38, 34, 55, 51, 47, 43, 39, 60, 56, 52, 48, 44, 65, 61, 57, 53, 49, 70, 66, 62, 58, 54, 75, 71, 67, 63, 59, 80, 76, 72 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS 0 5 10 15 20 25 30 35 40 45 ... a(n)=5n 1 6 11 16 21 26 31 36 41 46 ... a(n)=5n+1 2 7 12 17 22 27 32 37 42 47 ... a(n)=5n+2 3 8 13 18 23 28 33 38 43 48 ... a(n)=5n+3 4 9 14 19 24 29 34 39 44 49 ... a(n)=5n+4 REFERENCES M. Cerasoli, F. Eugeni and M. Protasi, Elementi di Matematica Discreta, Bologna 1988 Emanuele Munarini and Norma Zagaglia Salvi, Matematica Discreta,UTET, CittaStudiEdizioni, Milano 1997 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 FORMULA Starting with term a(10): a(n+5k) = a(n) + 5k, with k>=1. G.f.: x*(5-4*x+9*x^2-4*x^3-4*x^4+8*x^5-13*x^7+21*x^9-17*x^10+4*x^14)/(1-x-x^5+x^6). - Robert Israel, Mar 23 2017 MAPLE 0, 5, 1, 10, 6, 2, 15, 11, 7, 3, seq(seq(t + 5*k, t=[15, 11, 7, 3, -1]), k=1..20); # Robert Israel, Mar 23 2017 MATHEMATICA Select[Join[{0}, Table[Most[NestList[#-4&, 5n, 5]], {n, 20}]]//Flatten, #>=0&] (* Harvey P. Dale, Nov 26 2016 *) CROSSREFS Cf. A115302, A116080. Sequence in context: A063475 A329752 A135855 * A013612 A112830 A209669 Adjacent sequences:  A116544 A116545 A116546 * A116548 A116549 A116550 KEYWORD nonn AUTHOR Giovanni Teofilatto, Mar 16 2006 STATUS approved

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Last modified August 9 04:17 EDT 2020. Contains 336319 sequences. (Running on oeis4.)