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Search: id:A153170
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| A153170 |
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Numbers n such that 3n+2 is not prime |
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+0
1
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| 2, 4, 6, 8, 10, 11, 12, 14, 16, 18, 20, 21, 22, 24, 25, 26, 28, 30, 31, 32, 34, 36, 38, 39, 30, 41, 42, 44, 46, 47, 48, 50, 51, 52, 53, 54, 56, 58, 60, 61, 62, 64, 66, 67, 68, 69, 70, 71, 72, 73, 74, 76, 78, 80, 81, 82, 84, 86, 88, 90, 91, 92, 94, 95, 96, 98, 99, 100, 101, 102
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Of course n is even
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FORMULA
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Let p prime number n=[(p^2+2p-2)/3] mod (2p); (For columns of sound odd place) n=[(p^2+4p-2)/3] mod (2p); (For columns of sound even place)
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EXAMPLE
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*; *, *; *, 11, *; *, *, *, *; *, *, 25, *, *; *, 21, *, *, 47, *; *, *, *, *, *, *, *; *, *, 39, *, *, 73, *, *; *. 31, *, *, 69, *, *, 107, *;
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CROSSREFS
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Cf. A024893
Sequence in context: A081472 A097660 A154809 this_sequence A067030 A072427 A050420
Adjacent sequences: A153167 A153168 A153169 this_sequence A153171 A153172 A153173
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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 20 2008
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