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Search: id:A056121
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| 0, 8, 17, 27, 38, 50, 63, 77, 92, 108, 125, 143, 162, 182, 203, 225, 248, 272, 297, 323, 350, 378, 407, 437, 468, 500, 533, 567, 602, 638, 675, 713, 752, 792, 833, 875, 918, 962, 1007, 1053, 1100, 1148, 1197, 1247, 1298, 1350, 1403, 1457, 1512, 1568, 1625
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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a(n)=A000096 + 6 * A001477, a(n)=A056119 + A001477 and a(n)=A056126 - A001477 - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Oct 01 2006
a(n) = A126890(n,7) for n>6. - Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Dec 30 2006
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FORMULA
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G.f.(x)=x(8-7x)/(1-x)^3.
a(n)=C(n,2)-7*n ,n>=15 - 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=7..n): seq(a(n), n=6..56); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Oct 01 2006
[seq(binomial(n, 2)-7*n , n=15..65)]; - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Nov 26 2006
seq(sum(k, k=8..n), n=7..57); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 09 2008
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CROSSREFS
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Cf. A056119.
Cf. A000096, A056119, A056126, A056000, A001477.
Adjacent sequences: A056118 A056119 A056120 this_sequence A056122 A056123 A056124
Sequence in context: A017257 A052222 A044441 this_sequence A028884 A099358 A077222
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KEYWORD
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easy,nonn
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AUTHOR
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Barry E. Williams, Jul 06 2000
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EXTENSIONS
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More terms from James A. Sellers (sellersj(AT)math.psu.edu), Jul 07 2000
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