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A134327
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a(n)=(n^5-n-5)/5.
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2
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-1, -1, 5, 47, 203, 623, 1553, 3359, 6551, 11807, 19997, 32207, 49763, 74255, 107561, 151871, 209711, 283967, 377909, 495215, 639995, 816815, 1030721, 1287263, 1592519, 1953119, 2376269, 2869775, 3442067, 4102223, 4859993, 5725823, 6710879, 7827071, 9087077, 10504367, 12093227, 13868783
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| All numbers generated by polynomial A131176 are congruent to 4 mod 5. The polynomial n^5-n-5 is irreducible.
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FORMULA
| a(n) = ((n^5 - n - 1) - 4)/5
G.f.: (-1+5*x-4*x^2+22*x^3+x^4+x^5)/(-1+x)^6. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 14 2007
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MATHEMATICA
| Table[((n^5 - n - 1) - 4)/5, {n, 0, 100}]
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CROSSREFS
| Cf. A131176, A134326, A134328.
Sequence in context: A056248 A126575 A139889 * A122501 A049281 A198854
Adjacent sequences: A134324 A134325 A134326 * A134328 A134329 A134330
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KEYWORD
| sign
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AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Oct 20 2007
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