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A053741
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Sum of even numbers in range 10n to 10n+9.
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3
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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; internal format)
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OFFSET
| 0,1
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..10000
Tanya Khovanova, Recursive Sequences
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FORMULA
| 50*n+20.
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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.
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MATHEMATICA
| 50Range[50]-30 (* From Harvey P. Dale, Mar 6 2011 *)
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PROG
| (MAGMA) [20+50*n: n in [0..50]]; // Vincenzo Librandi, Aug 12 2011
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CROSSREFS
| Cf. A053742, A053743.
Sequence in context: A044539 A153728 A071395 * A052516 A083873 A143854
Adjacent sequences: A053738 A053739 A053740 * A053742 A053743 A053744
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KEYWORD
| nonn,easy
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AUTHOR
| Odimar Fabeny (fabeny(AT)braznet.com.br), Feb 13 2000
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EXTENSIONS
| More terms from James A. Sellers (sellersj(AT)math.psu.edu), Feb 22 2000
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