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A019320
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Cyclotomic polynomials at x=2.
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19
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2, 1, 3, 7, 5, 31, 3, 127, 17, 73, 11, 2047, 13, 8191, 43, 151, 257, 131071, 57, 524287, 205, 2359, 683, 8388607, 241, 1082401, 2731, 262657, 3277, 536870911, 331, 2147483647, 65537, 599479, 43691, 8727391
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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LINKS
| T. D. Noe, Table of n, a(n) for n=0..1000
Joerg Arndt, Fxtbook
Index entries for cyclotomic polynomials, values at X
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FORMULA
| LCM{2^k - 1, k=1..n}/LCM{2^k - 1, k=1..n-1}, n >1. - Vladeta Jovovic (vladeta(AT)eunet.rs), Jan 20 2002
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MAPLE
| with(numtheory, cyclotomic); f := n->subs(x=2, cyclotomic(n, x)); seq(f(i), i=0..64);
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PROG
| (PARI) vector(20, n, polcyclo(n, 2)) \\ Charles R Greathouse IV, May 18, 2011
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CROSSREFS
| A019320[n] = A063696[n]-A063698[n] for up to n=104. Same sequence in binary: A063672. Cf. A054432, A020501, A034268.
Sequence in context: A058170 A127896 A010757 * A201615 A033640 A112027
Adjacent sequences: A019317 A019318 A019319 * A019321 A019322 A019323
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KEYWORD
| nonn
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AUTHOR
| Simon Plouffe (simon.plouffe(AT)gmail.com)
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