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Search: id:A057541
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| A057541 |
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Birthday set of order 9: i.e. numbers congruent to +/- 1 modulo 2, 3, 4, 5, 6, 7, 8 and 9. |
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+0
3
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| 1, 71, 449, 559, 631, 881, 1009, 1079, 1441, 1511, 1639, 1889, 1961, 2071, 2449, 2519, 2521, 2591, 2969, 3079, 3151, 3401, 3529, 3599, 3961, 4031, 4159, 4409, 4481, 4591, 4969, 5039, 5041, 5111, 5489, 5599, 5671, 5921, 6049, 6119, 6481, 6551, 6679
(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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5599 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, -1 mod 8 and 1 mod 9.
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CROSSREFS
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Maple script at A057538. Other birthday sets: A007310, A057539 and A057540.
Sequence in context: A142375 A142304 A078949 this_sequence A142432 A142674 A112750
Adjacent sequences: A057538 A057539 A057540 this_sequence A057542 A057543 A057544
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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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