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Search: id:A085250
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| A085250 |
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4 times hexagonal numbers: 4n(2n-1). |
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+0
15
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| 0, 4, 24, 60, 112, 180, 264, 364, 480, 612, 760, 924, 1104, 1300, 1512, 1740, 1984, 2244, 2520, 2812, 3120, 3444, 3784, 4140, 4512, 4900, 5304, 5724, 6160, 6612, 7080, 7564, 8064, 8580, 9112, 9660, 10224, 10804, 11400, 12012, 12640, 13284
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n) = A067239(n)/2, for n>0.
Sum(n>0) 1/a(n) = log(2)/2
a(n) = A000384(n)*4. [From Omar E. Pol (info(AT)polprimos.com), Dec 11 2008]
a(n)=16*n+a(n-1)-28 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 13 2009]
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EXAMPLE
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For n=2, a(2)=16*2+0-28=4; n=3, a(3)=16*3+4-28=24; n=4, a(4)=16*4+24-28=60 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 13 2009]
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MATHEMATICA
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s=0; lst={s}; Do[s+=n++ +4; AppendTo[lst, s], {n, 0, 7!, 16}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 16 2008]
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CROSSREFS
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Cf. A067239.
Cf. A000384. [From Omar E. Pol (info(AT)polprimos.com), Dec 11 2008]
Sequence in context: A052645 A157625 A128205 this_sequence A166870 A124350 A112611
Adjacent sequences: A085247 A085248 A085249 this_sequence A085251 A085252 A085253
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KEYWORD
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nonn,new
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Jun 23 2003
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EXTENSIONS
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Edited by Don Reble (djr(AT)nk.ca), Nov 13 2005
Added zero, better definition, corrected offset and edited original formula. - Omar E. Pol (info(AT)polprimos.com), Dec 11 2008
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