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Search: id:A027689
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| A027689 |
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Numbers of form n^2 + (n+4). |
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+0
5
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| 4, 6, 10, 16, 24, 34, 46, 60, 76, 94, 114, 136, 160, 186, 214, 244, 276, 310, 346, 384, 424, 466, 510, 556, 604, 654, 706, 760, 816, 874, 934, 996, 1060, 1126, 1194, 1264, 1336, 1410, 1486, 1564, 1644, 1726, 1810, 1896, 1984, 2074, 2166, 2260
(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)=6) [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)=A000217(n-2)+A000217(n+2) for n>0. - Jon Perry (perry(AT)globalnet.co.uk), Jul 23 2003
a(n)=2*n+a(n-1)-2 (with a(1)=4) [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+4-2=6; n=3, a(3)=2*3+6-2=10; n=4, a(4)=2*4+10-2=16 [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+3, 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: A076529 A102768 A075637 this_sequence A023501 A050887 A078642
Adjacent sequences: A027686 A027687 A027688 this_sequence A027690 A027691 A027692
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KEYWORD
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nonn
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AUTHOR
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Patrick De Geest (pdg(AT)worldofnumbers.com)
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