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A020513
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Cyclotomic polynomials at x=-1.
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4
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-1, -2, 0, 1, 2, 1, 3, 1, 2, 1, 5, 1, 1, 1, 7, 1, 2, 1, 3, 1, 1, 1, 11, 1, 1, 1, 13, 1, 1, 1, 1, 1, 2, 1, 17, 1, 1, 1, 19, 1, 1, 1, 1, 1, 1, 1, 23, 1, 1, 1, 5, 1, 1, 1, 3, 1, 1, 1, 29, 1, 1, 1, 31, 1, 2
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| For n >= 3: if n = 2*p^m with a prime p then a(n) = p otherwise a(n) = 1. - Ola Veshta (olaveshta(AT)my-deja.com), Jun 01 2001
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MAPLE
| with(numtheory, cyclotomic); f := n->subs(x=-1, cyclotomic(n, x)); seq(f(i), i=0..64);
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CROSSREFS
| Sequence in context: A029277 A077905 A131331 * A029276 A109248 A131866
Adjacent sequences: A020510 A020511 A020512 * A020514 A020515 A020516
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KEYWORD
| sign
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AUTHOR
| Simon Plouffe (simon.plouffe(AT)gmail.com)
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