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Search: id:A133203
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| 0, 1, 3, 31, 67, 111, 163, 223, 291, 367, 451, 543, 643, 751, 867, 991, 1123, 1263, 1411, 1567, 1731, 1903, 2083, 2271, 2467, 2671, 2883, 3103, 3331, 3567, 3811, 4063, 4323, 4591, 4867, 5151, 5443, 5743, 6051, 6367
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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Apart from {0,1} at the start, 15 of the first 30 are primes.
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FORMULA
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G.f.: x(1+25x^2-18x^3)/(1-x)^3. a(n)=4n^2+8n-29, n>1. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 01 2008
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EXAMPLE
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fz(1)=0; fz(2)=1; fz(3)=3;
for k=4:n
fz(k)=fz(k-1)+8*k+4;
end
y=fz(n);
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PROGRAM
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MatLab program: function y=fib(n)
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CROSSREFS
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Sequence in context: A141966 A050833 A041207 this_sequence A062616 A031916 A137185
Adjacent sequences: A133200 A133201 A133202 this_sequence A133204 A133205 A133206
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KEYWORD
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nonn
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AUTHOR
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Matt Wynne (mattwyn(AT)verizon.net), Aug 27 2008
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 01 2008
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