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Search: id:A067199
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| A067199 |
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a(n) * 28 * c + 1 is prime for c = 1, 2, 4, 7, and 14. |
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+0
1
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| 2136, 2211, 4071, 5106, 5430, 9000, 10656, 17655, 18315, 20220, 20805, 21381, 22356, 22920, 23025, 29616, 37050, 39261, 45795, 49920, 55686, 60435, 62205, 64380, 79356, 81345, 91455, 94800, 95910, 96285, 105336, 108585, 111885, 118626
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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The product of the 5 primes is a Carmichael number. 28=1+2+4+7+14.
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REFERENCES
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H. Davenport, The Higher Arithmetic. Cambridge Univ. Press, 7th ed., 1999, exercise 8.4.
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EXAMPLE
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2136 results in Carmichael number 599966117492747584686619009.
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CROSSREFS
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Cf. A046025 (based on 6 instead of 28, exercise 8.3 in Davenport).
Adjacent sequences: A067196 A067197 A067198 this_sequence A067200 A067201 A067202
Sequence in context: A031544 A066817 A110024 this_sequence A064249 A020398 A115435
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KEYWORD
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nonn,easy
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AUTHOR
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Frank.Ellermann(AT)t-online.de, Feb 19 2002
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