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Search: id:A154431
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| A154431 |
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Number p (prime) such that 5p^2-p+1 is prime |
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+0
2
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| 2, 3, 7, 17, 19, 29, 43, 73, 107, 199, 229, 359, 397, 409, 443, 449, 479, 563, 593, 607, 617, 677, 787, 887, 953, 1013, 1069, 1087, 1109, 1213, 1277, 1279, 1283, 1367, 1409, 1549, 1613, 1627, 1667, 1759, 1867, 1877, 1993, 2003, 2129, 2269, 2297, 2423, 2539
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OFFSET
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1,1
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EXAMPLE
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For p=2, 5p^2-p+1=19; p=107, 5p^2-p+1=57139; p=199, 5p^2-p+1=197807
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MAPLE
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a := proc (n) if isprime(n) = true and isprime(5*n^2-n+1) = true then n end if end proc: seq(a(n), n = 2 .. 3000); [From Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 20 2009]
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CROSSREFS
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Cf. A154432
Sequence in context: A141795 A077322 A160513 this_sequence A089144 A045332 A045333
Adjacent sequences: A154428 A154429 A154430 this_sequence A154432 A154433 A154434
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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 09 2009
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EXTENSIONS
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Extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 20 2009
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