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Search: id:A070020
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| A070020 |
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At these values of n the first, 2nd and 3rd cyclotomic polynomials all give prime numbers. |
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+0
4
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| 6, 12, 138, 150, 192, 348, 642, 1020, 1092, 1230, 1620, 1788, 1932, 2112, 2142, 2238, 2658, 2688, 2730, 3330, 3540, 3918, 4002, 4158, 5010, 5640, 6090, 6450, 6552, 6702, 7950, 8088, 9000, 9042, 9240, 9462, 9768, 10008, 10092, 10272, 10302, 10332
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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n-1, n+1 and 1+n+n^2 are all primes.
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EXAMPLE
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n=6: 5,7 and 43 are prime values of first 3 cyclotomic polynomials
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CROSSREFS
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Cf. A070155-A070157, A000068, A006313-A006316, A056993-A056995, A005574, A057465, A057002, A070025, A070042.
Adjacent sequences: A070017 A070018 A070019 this_sequence A070021 A070022 A070023
Sequence in context: A051586 A102077 A102062 this_sequence A002922 A014402 A051784
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KEYWORD
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easy,nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), May 07 2002
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