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Search: id:A153039
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| A153039 |
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Numbers n such that 2*n-7 is not a prime |
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+0
4
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| 8, 11, 14, 16, 17, 20, 21, 23, 26, 28, 29, 31, 32, 35, 36, 38, 41, 42, 44, 46, 47, 49, 50, 51, 53, 56, 59, 61, 62, 63, 64, 65, 66, 68, 70, 71, 74, 75, 76, 77, 80, 81, 83, 84, 86, 88, 89, 91, 92, 95, 96, 97, 98, 101
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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Let p = prime n = (p^2+7)/2 mod (p)
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EXAMPLE
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8; 11, 16; 14, 21, 28; 17, 26, 35, 44; 20, 31, 42, 53, 64; 23, 36, 49, 62, 75, 88; 26, 41, 56, 71, 86, 101, 116;
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CROSSREFS
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Cf. A089192
Sequence in context: A122195 A064153 A106670 this_sequence A061570 A096679 A101573
Adjacent sequences: A153036 A153037 A153038 this_sequence A153040 A153041 A153042
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KEYWORD
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nonn
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AUTHOR
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Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Dec 17 2008
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