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0, 15, 80, 255, 624, 1295, 2400, 4095, 6560, 9999, 14640, 20735, 28560, 38415, 50624, 65535, 83520, 104975, 130320, 159999, 194480, 234255, 279840, 331775, 390624, 456975, 531440, 614655, 707280, 809999, 923520, 1048575, 1185920, 1336335
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| a(n) mod 5 = 0 iff n mod 5 > 0: a(A008587(n)) = 4; a(A047201(n)) = 0; a(n) mod 5 = 4*(1-A079998(n)).
A129292(n) = number of divisors of a(n) that are not greater than n. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 09 2007
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 1..1000
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FORMULA
| G.f.: x^2*(15+5*x+5*x^2-x^3)/(1-x)^5. [Colin Barker, Jan 10 2012]
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MATHEMATICA
| Table[n^4-1, {n, 1, 60}] (* From Vladimir Joseph Stephan Orlovsky, Apr 15 2011 *)
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PROG
| (MAGMA) [n^4 - 1: n in [1..50]]; // Vincenzo Librandi, May 01 2011
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CROSSREFS
| Cf. A024002, A000583, A005563, A123866, A123867, A123868.
Sequence in context: A180577 A033594 A059377 * A024002 A050149 A055815
Adjacent sequences: A123862 A123863 A123864 * A123866 A123867 A123868
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KEYWORD
| nonn,easy
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AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 16 2006
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