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Search: id:A027694
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| A027694 |
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Numbers of form n^2 + (n+9). |
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+0
4
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| 9, 11, 15, 21, 29, 39, 51, 65, 81, 99, 119, 141, 165, 191, 219, 249, 281, 315, 351, 389, 429, 471, 515, 561, 609, 659, 711, 765, 821, 879, 939, 1001, 1065, 1131, 1199, 1269, 1341, 1415, 1491, 1569, 1649, 1731, 1815, 1901, 1989, 2079, 2171
(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)=11) [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)=9) [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+9-2=11; n=3, a(3)=2*3+11-2=15; n=4, a(4)=2*4+15-2=21 [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+8, n=0..46); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 07 2008
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CROSSREFS
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Cf. A002522.
Sequence in context: A113339 A037009 A163096 this_sequence A063191 A048464 A075824
Adjacent sequences: A027691 A027692 A027693 this_sequence A027695 A027696 A027697
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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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