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Search: id:A057540
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| A057540 |
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Birthday set of order 8: i.e. numbers congruent to +/- 1 modulo 2, 3, 4, 5, 6, 7 and 8. |
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+0
2
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| 1, 41, 71, 169, 209, 239, 281, 391, 449, 559, 601, 631, 671, 769, 799, 839, 841, 881, 911, 1009, 1049, 1079, 1121, 1231, 1289, 1399, 1441, 1471, 1511, 1609, 1639, 1679, 1681, 1721, 1751, 1849, 1889, 1919, 1961, 2071, 2129, 2239, 2281, 2311, 2351, 2449
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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A. Feist, On the Natural Density of Birthday Sets, The Pentagon, 60 (No. 1, Fall 2000), 31-35.
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EXAMPLE
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2129 is on the list because it is congruent to 1 mod 2, -1 mod 3, 1 mod 4, -1 mod 5, -1 mod 6, 1 mod 7 and 1 mod 8.
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CROSSREFS
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Cf. A057538 for Maple script. A007310, A057539 and A057541 are also birthday sets.
Sequence in context: A039524 A140374 A054806 this_sequence A105126 A142038 A044107
Adjacent sequences: A057537 A057538 A057539 this_sequence A057541 A057542 A057543
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KEYWORD
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easy,nonn
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AUTHOR
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Andrew R. Feist (andrewf(AT)math.duke.edu), Sep 06 2000
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