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A053743 Sum of numbers in range 10n to 10n+9. 2
45, 145, 245, 345, 445, 545, 645, 745, 845, 945, 1045, 1145, 1245, 1345, 1445, 1545, 1645, 1745, 1845, 1945, 2045, 2145, 2245, 2345, 2445, 2545, 2645, 2745, 2845, 2945, 3045, 3145, 3245, 3345, 3445, 3545, 3645, 3745, 3845, 3945, 4045, 4145, 4245, 4345 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..43.

Tanya Khovanova, Recursive Sequences

Index entries for linear recurrences with constant coefficients, signature (2,-1).

FORMULA

a(n) = 100*n+45.

a(n) = 2*a(n-1)-a(n-2). G.f.: 5*(9+11*x)/(1-x)^2. [Colin Barker, Jun 26 2012]

EXAMPLE

45 = sum of 0,1,2,3,4,5,6,7,8,9; 145 = sum of 10,11,12,13,14,15,16,17,18,19 ...

CROSSREFS

Cf. A053741, A053742.

Sequence in context: A156370 A044377 A044758 * A234336 A173371 A061658

Adjacent sequences:  A053740 A053741 A053742 * A053744 A053745 A053746

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 25 05:37 EDT 2017. Contains 284036 sequences.