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Search: id:A152734
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| A152734 |
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5 times pentagonal numbers: 5n(3n-1)/2. |
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+0
4
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| 0, 5, 25, 60, 110, 175, 255, 350, 460, 585, 725, 880, 1050, 1235, 1435, 1650, 1880, 2125, 2385, 2660, 2950, 3255, 3575, 3910, 4260, 4625, 5005, 5400, 5810, 6235, 6675, 7130, 7600, 8085, 8585, 9100, 9630, 10175, 10735, 11310, 11900
(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) = A000326(n)*5.
a(n)=15*n+a(n-1)-25 (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)=15*2+0-25=5; n=3, a(3)=15*3+5-25=25; n=4, a(4)=15*4+25-25=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; AppendTo[lst, s], {n, 5, 7!, 15}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Apr 03 2009]
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CROSSREFS
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Cf. A000326.
Sequence in context: A045576 A146649 A146412 this_sequence A080856 A060820 A146404
Adjacent sequences: A152731 A152732 A152733 this_sequence A152735 A152736 A152737
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KEYWORD
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easy,nonn,new
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Dec 11 2008
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