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Search: id:A154650
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| A154650 |
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Prime p such that 4*p^2-8*p-9 is a prime. |
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+0
2
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| 3, 7, 13, 19, 37, 43, 61, 103, 109, 139, 181, 223, 229, 241, 307, 367, 397, 409, 433, 457, 463, 577, 631, 661, 727, 751, 811, 823, 829, 853, 919, 1009, 1063, 1087, 1117, 1213, 1231, 1279, 1291, 1321, 1423, 1429, 1471, 1597, 1609, 1699, 1741, 1753, 1783, 1789
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OFFSET
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1,1
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EXAMPLE
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For p=7, 4*p^2-8*p-9=131; p=43, 4*p^2-8*p-9=7043; p=229, 4*p^2-8*p-9=207923
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MAPLE
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a := proc (n) if isprime(n) = true and isprime(4*n^2-8*n-9) = true then n else end if end proc: seq(a(n), n = 1 .. 2000); [From Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 27 2009]
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CROSSREFS
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C. A154648
Sequence in context: A023217 A106077 A048977 this_sequence A015913 A023200 A046136
Adjacent sequences: A154647 A154648 A154649 this_sequence A154651 A154652 A154653
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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 18 2009
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EXTENSIONS
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Extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 27 2009
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