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Search: id:A101859
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| A101859 |
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a(n) = 11 + (23*n)/2 + n^2/2. |
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+0
3
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| 0, 11, 23, 36, 50, 65, 81, 98, 116, 135, 155, 176, 198, 221, 245, 270, 296, 323, 351, 380, 410, 441, 473, 506, 540, 575, 611, 648, 686, 725, 765, 806, 848, 891, 935, 980, 1026, 1073, 1121, 1170, 1220, 1271, 1323, 1376, 1430, 1485, 1541, 1598, 1656, 1715, 1775, 1836
(list; graph; listen)
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OFFSET
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-1,2
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COMMENT
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a(n)=A000096 + 9 * A001477 and a(n)=A056126 + A001477. - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Oct 01 2006
a(n) = A126890(n+1,10) for n>8. - Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Dec 30 2006
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LINKS
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C. Rossiter, Depictions, Explorations and Formulas of the Euler/Pascal Cube.
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FORMULA
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a(n)=C(n,2)-10*n ,n>=21 - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Nov 26 2006
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MAPLE
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a:=n->sum(floor(k+2*n/(k+n)), k=10..n): seq(a(n), n=10..57); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Oct 01 2006
[seq(binomial(n, 2)-10*n , n=21..72)]; - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Nov 26 2006
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CROSSREFS
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Cf. A000096, A056126, A001477.
Adjacent sequences: A101856 A101857 A101858 this_sequence A101860 A101861 A101862
Sequence in context: A041549 A136771 A017653 this_sequence A079664 A135978 A139493
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KEYWORD
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easy,nonn
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AUTHOR
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Cecilia Rossiter (cecilia(AT)noticingnumbers.net), Dec 18 2004
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EXTENSIONS
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Edited by njas, Oct 07 2006
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