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 A144396 The odd numbers greater than 1. 17
 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125, 127, 129, 131, 133 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Last number of the n-th row of the triangle described in A142717. If negated, these are also the values at local minima of the sequence A141620. a(n) is the shortest leg of the n-th Pythagorean triple with consecutive longer leg and hypotenuse. The n-th such triple is given by (2n+1,2n^2+2n, 2n^2+2n+1), so that the longer legs are A046092(n) and the hypotenuses are A099776(n). - Ant King, Feb 10 2011 Numbers k such that the symmetric representation of sigma(k) has a pair of bars as its ends (cf. A237593). - Omar E. Pol, Sep 28 2018 LINKS Muniru A Asiru, Table of n, a(n) for n = 1..1000 Index entries for linear recurrences with constant coefficients, signature (2,-1) FORMULA a(n) = A005408(n+1) = A000290(n+1) - A000290(n). G.f.: x*(3-x)/(1-x)^2. - Jaume Oliver Lafont, Aug 30 2009 a(n) = A254858(n-1,2). - Reinhard Zumkeller, Feb 09 2015 MAPLE seq(n, n=3..200, 2); # Muniru A Asiru, Sep 28 2018 MATHEMATICA Range[3, 200, 2] (* Vladimir Joseph Stephan Orlovsky, Feb 19 2012 *) PROG (Haskell) a144396 = (+ 1) . (* 2) a144396_list = [3, 5 ..] -- Reinhard Zumkeller, Feb 09 2015 (GAP) List([3, 5..200], n->n); # Muniru A Asiru, Sep 28 2018 CROSSREFS Complement of A004275 and of A004277. Cf. A000217, A002378, A005408, A007395, A046092, A099776, A237593, A254858. Sequence in context: A004273 A005408 A176271 * A060747 A089684 A283002 Adjacent sequences:  A144393 A144394 A144395 * A144397 A144398 A144399 KEYWORD nonn,less,easy AUTHOR Paul Curtz, Oct 03 2008 EXTENSIONS Edited by R. J. Mathar, May 21 2009 STATUS approved

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Last modified February 20 12:38 EST 2019. Contains 320327 sequences. (Running on oeis4.)