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A091568
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Primes of the form p^2-p-1, where p is prime.
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8
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5, 19, 41, 109, 271, 811, 929, 2161, 3659, 4421, 4969, 9311, 10099, 16001, 17029, 19181, 22051, 32579, 38611, 57839, 72091, 93941, 109229, 128521, 143261, 157211, 166871, 175141, 176819, 201151, 208391, 228961, 236681, 240589, 358201, 367841
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OFFSET
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1,1
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 1..5000
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MATHEMATICA
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lst={}; Do[p=Prime[n]; p=p^2-p-1; If[PrimeQ[p], AppendTo[lst, p]], {n, 3*5!}]; lst [From Vladimir Joseph Stephan Orlovsky, Jan 27 2009]
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PROG
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(PARI) isA091568(n)={local(i); i=floor((1/2)+sqrt(n+(5/4))); isprime(i) && n==i^2-i-1 && isprime(n)} [From Michael B. Porter, May 12 2010]
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CROSSREFS
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Cf. A091567 (p such that p^2-p-1 prime).
Sequence in context: A100572 A119534 A033622 * A147307 A089148 A098319
Adjacent sequences: A091565 A091566 A091567 * A091569 A091570 A091571
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KEYWORD
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nonn
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AUTHOR
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T. D. Noe, Jan 21 2004
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STATUS
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approved
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