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Search: id:A027691
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| A027691 |
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Numbers of form n^2 + (n+6). |
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+0
3
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| 6, 8, 12, 18, 26, 36, 48, 62, 78, 96, 116, 138, 162, 188, 216, 246, 278, 312, 348, 386, 426, 468, 512, 558, 606, 656, 708, 762, 818, 876, 936, 998, 1062, 1128, 1196, 1266, 1338, 1412, 1488, 1566, 1646, 1728, 1812, 1898, 1986, 2076, 2168, 2262
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Except for the first term, a(n)=2*n+a(n-1), (with a(1)=8) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 23 2009]
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LINKS
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P. De Geest, Palindromic Quasi_Over_Squares of the form n^2+(n+X)
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FORMULA
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a(n)=2*n+a(n-1)-2 (with a(1)=6) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 07 2009]
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EXAMPLE
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For n=2, a(2)=2*2+6-2=8; n=3, a(3)=2*3+8-2=12; n=4, a(4)=2*4+12-2=18 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 07 2009]
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MAPLE
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with (combinat):seq(fibonacci(3, n)+n+5, n=0..47); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 07 2008
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CROSSREFS
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Cf. A002522.
Sequence in context: A050992 A090259 A089241 this_sequence A146529 A062533 A077670
Adjacent sequences: A027688 A027689 A027690 this_sequence A027692 A027693 A027694
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KEYWORD
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nonn,new
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AUTHOR
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Patrick De Geest (pdg(AT)worldofnumbers.com)
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