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Search: id:A153082
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| A153082 |
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Numbers n such that 2n+13 is not prime |
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+0
2
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| 1, 4, 6, 7, 10, 11, 13, 16, 18, 19, 21, 22, 25, 26, 28, 31, 32, 34, 36, 37, 39, 40, 41, 43, 46, 49, 51, 52, 53, 54, 55, 56, 58, 60, 61, 64, 65, 66, 67, 70, 71, 73, 74, 76, 78, 79
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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Let p = prime n = (p^2-13)/2 mod (p)
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EXAMPLE
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-2; 1, 6; 4, 11, 18; 7, 16, 25, 34; 10, 21, 32, 43, 54; 13, 26, 39, 52, 65, 78; 16, 31, 46, 61, 76, 91, 106;
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CROSSREFS
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Cf. A153081
Sequence in context: A123088 A153235 A133483 this_sequence A026147 A032785 A096887
Adjacent sequences: A153079 A153080 A153081 this_sequence A153083 A153084 A153085
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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 18 2008
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