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Search: id:A019320
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| A019320 |
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Cyclotomic polynomials at x=2. |
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+0
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; listen)
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OFFSET
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0,1
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LINKS
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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
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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
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with(numtheory, cyclotomic); f := n->subs(x=2, cyclotomic(n, x)); seq(f(i), i=0..64);
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CROSSREFS
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A019320[n] = A063696[n]-A063698[n] for up to n=104. Same sequence in binary: A063672. Cf. A054432, A020501.
Cf. A034268.
Sequence in context: A058170 A127896 A010757 this_sequence A033640 A112027 A024404
Adjacent sequences: A019317 A019318 A019319 this_sequence A019321 A019322 A019323
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KEYWORD
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nonn
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AUTHOR
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Simon Plouffe (simon.plouffe(AT)gmail.com)
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