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A057463
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Numbers n such that x^n + x^4 + 1 is irreducible over GF(2).
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1
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1, 3, 7, 9, 15, 39, 57, 81, 105, 1239, 5569, 9457, 11095, 11631, 12327
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Joerg Arndt, Fxtbook
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MAPLE
| for m from 1 to 200 do if(Irreduc(x^m + x^4 + 1) mod 2) then printf("%d, ", m):fi:od: # Nathaniel Johnston, Apr 19 2011
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MATHEMATICA
| Do[ If[ ToString[ Factor[ x^n + x^4 + 1, Modulus -> 2 ] ] == ToString[ x^n + x^4 + 1 ], Print[ n ] ], {n, 0, 750} ]
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CROSSREFS
| Cf. A002475.
Sequence in context: A191131 A128539 A192118 * A118258 A117583 A126106
Adjacent sequences: A057460 A057461 A057462 * A057464 A057465 A057466
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KEYWORD
| nonn,more
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 27 2000
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EXTENSIONS
| a(10) - a(15) from Nathaniel Johnston (nathaniel(AT)nathanieljohnston.com), Apr 19 2011
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