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A053741 Sum of even numbers in range 10*n to 10*n+9. 3
20, 70, 120, 170, 220, 270, 320, 370, 420, 470, 520, 570, 620, 670, 720, 770, 820, 870, 920, 970, 1020, 1070, 1120, 1170, 1220, 1270, 1320, 1370, 1420, 1470, 1520, 1570, 1620, 1670, 1720, 1770, 1820, 1870, 1920, 1970, 2020, 2070, 2120, 2170, 2220, 2270 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
Tanya Khovanova, Recursive Sequences
FORMULA
a(n) = 50*n + 20.
From Colin Barker, Jun 27 2012: (Start)
a(n) = 2*a(n-1) - a(n-2).
G.f.: 10*(2+3*x)/(1-x)^2. (End)
E.g.f.: 10*(2+5*x)*exp(x). - G. C. Greubel, Sep 06 2019
EXAMPLE
20 is sum of 0, 2, 4, 6, 8;
70 is sum of 10, 12, 14, 16, 18;
120 is sum of 20, 22, 24, 26, 28; etc.
MAPLE
seq(10*(2+5*n), n=0..50); # G. C. Greubel, Sep 06 2019
MATHEMATICA
50Range[50]-30 (* Harvey P. Dale, Mar 06 2011 *)
PROG
(Magma) [20+50*n: n in [0..50]]; // Vincenzo Librandi, Aug 12 2011
(PARI) vector(50, n, 10*(5*n-3)) \\ G. C. Greubel, Sep 06 2019
(Sage) [10*(2+5*n) for n in (0..50)] # G. C. Greubel, Sep 06 2019
(GAP) List([0..50], n-> 10*(2+5*n)); # G. C. Greubel, Sep 06 2019
CROSSREFS
Sequence in context: A357921 A335557 A245856 * A303609 A052516 A083873
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 March 29 05:48 EDT 2024. Contains 371265 sequences. (Running on oeis4.)