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0, 2, 3, 2, 5, 1, 7, 2, 3, 1, 11, 1, 13, 1, 1, 2, 17, 1, 19, 1, 1, 1, 23, 1, 5, 1, 3, 1, 29, 1, 31, 2, 1, 1, 1, 1, 37, 1, 1, 1, 41, 1, 43, 1, 1, 1, 47, 1, 7, 1, 1, 1, 53, 1, 1, 1, 1, 1, 59, 1, 61, 1, 1, 2, 1, 1, 67, 1, 1, 1, 71, 1, 73
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Also the greatest common divisor of the prime factors of n. - Peter Luschny, Mar 22 2011
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LINKS
| T. D. Noe, Table of n, a(n) for n=1..10000
Index entries for cyclotomic polynomials, values at X
Yves Gallot, Cyclotomic polynomials and prime numbers
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MAPLE
| with(numtheory, cyclotomic); f := n->subs(x=1, cyclotomic(n, x)); seq(f(i), i=0..64);
A020500 := n -> igcd(op(numtheory[factorset](n))):
seq(A020500(i), i=1..73); # - Peter Luschny, Mar 22 2011
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CROSSREFS
| Apart from initial zero, same as A014963.
Cf. A007947.
Sequence in context: A092509 A014973 A157753 * A014963 A099636 A099635
Adjacent sequences: A020497 A020498 A020499 * A020501 A020502 A020503
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KEYWORD
| nonn,easy,nice
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AUTHOR
| Simon Plouffe (simon.plouffe(AT)gmail.com)
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