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A158790
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Odd integers n such that (x^n+1/x^n)/sqrt(8)+1 is prime, where x = sqrt(8)+sqrt(7).
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0
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1, 3, 11, 13, 77, 83, 181, 381, 525, 3829, 4141, 6093, 9589
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| No other terms below 32000.
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LINKS
| D.Broadhurst, The House That Jack Built
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PROG
| (PARI) { y = Mod(x, x^4-30*x^2+1); q8 = Mod(-1/2*x^3 + 31/2*x, x^4-30*x^2+1); forstep(n=1, 10^4, 2, if( ispseudoprime( polcoeff(lift((y^n+y^(-n))/q8), 0) + 1 ), print(n); ); ); } \\ From Max Alekseyev
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CROSSREFS
| Sequence in context: A083992 A105290 A201426 * A176049 A186078 A063963
Adjacent sequences: A158787 A158788 A158789 * A158791 A158792 A158793
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KEYWORD
| more,nonn
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AUTHOR
| Cino Hilliard (hillcino368(AT)hotmail.com), Mar 26 2009
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EXTENSIONS
| a(11)-a(13) from Max Alekseyev (maxale(AT)gmail.com), Dec 09 2011
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