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A053742 Sum of odd numbers in range 10n to 10n+9. 4
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

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

a(n) = 2*a(n-1)-a(n-2). G.f.: 25*(1+x)/(1-x)^2. - Colin Barker, Jun 27 2012

EXAMPLE

25 = 1+3+5+7+9; 75 = 11+13+15+17+19; ...

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

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 July 25 14:33 EDT 2017. Contains 289795 sequences.