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Search: id:A153507
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| A153507 |
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Numbers n (prime) such that n and 2*n^3+3 are both prime |
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1
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| 2, 13, 17, 19, 23, 29, 43, 53, 83, 127, 157, 233, 239, 283, 347, 433, 509, 523, 617, 647, 769, 773, 823, 859, 883, 919, 937, 1093, 1117, 1163, 1213, 1223, 1327, 1483, 1499, 1627, 1657, 1709, 1777, 1823, 1877, 1907, 1913, 1999, 2069, 2129, 2137, 2203, 2357
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OFFSET
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1,1
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EXAMPLE
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For n=43, 2*n^3+3=159017; n=769, 2*n^3+3= 909513221
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MAPLE
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a := proc (n) if isprime(n) = true and isprime(2*n^3+3) = true then n else end if end proc: seq(a(n), n = 1 .. 2500); [From Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 21 2009]
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CROSSREFS
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Sequence in context: A065245 A158845 A163786 this_sequence A124277 A038889 A152652
Adjacent sequences: A153504 A153505 A153506 this_sequence A153508 A153509 A153510
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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 28 2008
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EXTENSIONS
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Extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 21 2009
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