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Search: id:A027690
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| 5, 7, 11, 17, 25, 35, 47, 61, 77, 95, 115, 137, 161, 187, 215, 245, 277, 311, 347, 385, 425, 467, 511, 557, 605, 655, 707, 761, 817, 875, 935, 997, 1061, 1127, 1195, 1265, 1337, 1411, 1487, 1565, 1645, 1727, 1811, 1897, 1985, 2075, 2167, 2261
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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Except for the first term, a(n)=2*n+a(n-1), (with a(1)=7) [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)=5) [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+5-2=7; n=3, a(3)=2*3+7-2=11; n=4, a(4)=2*4+11-2=17 [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+4, n=0..47); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 07 2008
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MATHEMATICA
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Table[n^2+n+5, {n, 0, 100}] (T. D. Noe, Oct 29 2009)
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CROSSREFS
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Cf. A002522.
Sequence in context: A156104 A067830 A106862 this_sequence A087200 A153118 A145987
Adjacent sequences: A027687 A027688 A027689 this_sequence A027691 A027692 A027693
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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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EXTENSIONS
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Corrected by T. D. Noe (noe(AT)sspectra.com), Nov 09 2006
Definition and offset fixed by Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Jul 06 2009
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