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Search: id:A134631
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| A134631 |
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5*n^5 - 3*n^3 + 2*n^2. Coefficients and exponents are the prime numbers in decreasing order. |
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+0
1
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| 0, 4, 144, 1152, 4960, 15300, 38304, 83104, 162432, 293220, 497200, 801504, 1239264, 1850212, 2681280, 3787200, 5231104, 7085124, 9430992
(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) = 5*n^5 - 3*n^3 + 2*n^2.
G.f.: 4x*(1+30x+87x^2+32x^3)/(1-x)^6. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 14 2007
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EXAMPLE
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a(4)=4960 because 4^5=1024, 5*1024=5120, 4^3=64, 3*64=192, 4^2=16, 2*16=32 and we can write 5120-192+32=4960.
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CROSSREFS
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Cf. A000290, A000578, A000584, A045991, A100019, A133071.
Sequence in context: A053891 A053897 A017294 this_sequence A036511 A060870 A084703
Adjacent sequences: A134628 A134629 A134630 this_sequence A134632 A134633 A134634
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KEYWORD
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nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Nov 04 2007
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