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A153086
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Numbers n such that 4*n+7 is not prime
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0
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2, 5, 7, 8, 11, 12, 14, 17, 20, 21, 22, 23, 26, 27, 28, 29, 32, 34, 35, 37, 39, 41, 42, 44, 45, 47, 49, 50, 52, 53, 56, 57, 59, 60, 62, 63, 65, 67, 68, 70, 71, 72, 73, 74, 77, 78, 79, 80, 82, 83, 84, 86, 87, 89, 91, 92, 95, 96
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| Let p = prime n = [(p^2+2p-7)/4] mod (p)
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EXAMPLE
| *; 2, *; *, 7, *; 5, *, 14, *; *, 12, *, 23, *; 8, *, 21, *, 34, *; *, 17, *, 32, *, 47, *
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CROSSREFS
| Cf. A089986
Sequence in context: A050941 A153083 A140592 * A032784 A047268 A039580
Adjacent sequences: A153083 A153084 A153085 * A153087 A153088 A153089
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KEYWORD
| nonn
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AUTHOR
| Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Dec 18 2008
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