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Search: id:A028881
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| 2, 9, 18, 29, 42, 57, 74, 93, 114, 137, 162, 189, 218, 249, 282, 317, 354, 393, 434, 477, 522, 569, 618, 669, 722, 777, 834, 893, 954, 1017, 1082, 1149, 1218, 1289, 1362, 1437, 1514, 1593, 1674, 1757, 1842, 1929, 2018, 2109, 2202, 2297, 2394
(list; graph; listen)
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OFFSET
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3,1
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LINKS
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P. De Geest, Palindromic Quasipronics of the form n(n+x)
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FORMULA
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a(n)=2*n+a(n-1)+3 (with a(1)=2) [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+2+3=9; n=3, a(3)=2*3+9+3=18; n=4, a(4)=2*4+18+3=29 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 07 2009]
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MATHEMATICA
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s=0; lst={}; Do[s+=n; If[(s-7)>0, AppendTo[lst, s-7]], {n, 1, 6!, 2}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), May 25 2009]
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PROGRAM
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(Other) SAGE:[lucas_number2(2, n, 3-n) for n in xrange(2, 49)]# [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 12 2009]
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CROSSREFS
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Sequence in context: A126082 A083707 A103256 this_sequence A083708 A037421 A083423
Adjacent sequences: A028878 A028879 A028880 this_sequence A028882 A028883 A028884
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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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