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 A053742 Sum of odd numbers in range 10*n to 10*n+9. 7
 25, 75, 125, 175, 225, 275, 325, 375, 425, 475, 525, 575, 625, 675, 725, 775, 825, 875, 925, 975, 1025, 1075, 1125, 1175, 1225, 1275, 1325, 1375, 1425, 1475, 1525, 1575, 1625, 1675, 1725, 1775, 1825, 1875, 1925, 1975, 2025, 2075, 2125, 2175, 2225, 2275 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Integers that are the product of two integers ending with 5. - Michel Marcus, Mar 16 2019 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..10000 Tanya Khovanova, Recursive Sequences Index entries for linear recurrences with constant coefficients, signature (2,-1). FORMULA a(n) = 25 + 50*n. a(n) = a(n-1) + 50. - Harvey P. Dale, Aug 11 2011 From Colin Barker, Jun 27 2012: (Start) a(n) = 2*a(n-1) - a(n-2). G.f.: 25*(1+x)/(1-x)^2. (End) E.g.f.: 25*(1+2*x)*exp(x). - G. C. Greubel, Sep 06 2019 EXAMPLE 25 = 1+3+5+7+9; 75 = 11+13+15+17+19; ... MAPLE seq(25*(2*n+1), n=0..50); # G. C. Greubel, Sep 06 2019 MATHEMATICA Range[25, 2275, 50] (* or *) NestList[#+50&, 25, 50] (* Harvey P. Dale, Aug 11 2011 *) PROG (MAGMA) [25+50*n: n in [0..50]]; // Vincenzo Librandi, Aug 12 2011 (PARI) a(n)=50*n+25 \\ Charles R Greathouse IV, Aug 25 2014 (Sage) [25*(2*n+1) for n in (0..50)] # G. C. Greubel, Sep 06 2019 (GAP) List([0..50], n-> 25*(2*n+1)); # G. C. Greubel, Sep 06 2019 CROSSREFS Cf. A053741, A053743. Sequence in context: A044544 A045180 A270385 * A123296 A118610 A008852 Adjacent sequences:  A053739 A053740 A053741 * A053743 A053744 A053745 KEYWORD nonn,easy AUTHOR Odimar Fabeny, Feb 13 2000 EXTENSIONS More terms from James A. Sellers, Feb 22 2000 STATUS approved

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Last modified October 16 11:23 EDT 2019. Contains 328056 sequences. (Running on oeis4.)