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Search: id:A153085
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| A153085 |
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Numbers n such that 4n+5 is not prime |
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+0
2
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| 1, 4, 5, 7, 10, 11, 13, 15, 16, 18, 19, 20, 22, 25, 28, 29, 30, 31, 32, 34, 35, 37, 39, 40, 41, 43, 45, 46, 49, 50, 51, 52, 53, 54, 55, 58, 60, 61, 62, 64, 65, 67, 70, 71, 73, 74, 75, 76, 79, 80, 81, 82, 84, 85, 88, 89, 90, 91
(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^2-5)/4 mod (p)
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EXAMPLE
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1; *, 5; 4, *, 11; *, 10, *, 19; 7, *, 18, *, 29; *, 15, *, 28, *, 41;
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CROSSREFS
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Cf. A111215
Sequence in context: A139690 A035266 A035264 this_sequence A047259 A039577 A013951
Adjacent sequences: A153082 A153083 A153084 this_sequence A153086 A153087 A153088
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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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