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Search: id:A155723
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| A155723 |
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Numbers n such that 2n+9 is not prime |
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+0
3
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| 0, 3, 6, 8, 9, 12, 13, 15, 18, 20, 21, 23, 24, 27, 28, 30, 33, 34, 36, 38, 39, 41, 42, 43, 45, 48, 51, 53, 54, 55, 56, 57, 58, 60, 62, 63, 66, 67, 68, 69, 72, 73, 75, 76, 78, 80, 81, 83, 84, 87, 88, 89, 90, 93, 96, 97, 98, 99, 100, 102, 103, 104, 105, 106, 108, 111, 113, 114
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Let p (prime number) n=(p^2-9)/2 mod (p)
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FORMULA
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a(n)=2n+9
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EXAMPLE
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For n=0, a(0)=9, n=3, a(3)=15 Triangle begins: 0 3, 8; 6, 13, 20; 9,18,27,36; 12, 23, 34, 45, 56;
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CROSSREFS
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Cf. A155724, A155722
Sequence in context: A167195 A032489 A153769 this_sequence A095277 A140516 A005622
Adjacent sequences: A155720 A155721 A155722 this_sequence A155724 A155725 A155726
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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), Jan 25 2009
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