
Suites construites à partir des polynômes cyclotomiques
Polynômes cyclotomiques Phi
Définitions
Quelques polynômes cyclotomiques
Les polynômes cyclotomiques sont irréductibles dans Z[x].
Fichier texte de tous les polynômes Phi_n jusqu'à n=500
Phi(1)=x - 1
Phi(2)=x + 1
Phi(3)=x^2 + x + 1
Phi(4)=x^2 + 1
Phi(5)=x^4 + x^3 + x^2 + x + 1
Phi(6)=x^2 - x + 1
Phi(7)=x^6 + x^5 + x^4 + x^3 + x^2 + x + 1
Phi(8)=x^4 + 1
Phi(9)=x^6 + x^3 + 1
Phi(10)=x^4 - x^3 + x^2 - x + 1
Phi(11)=x^10 + x^9 + x^8 + x^7 + x^6 + x^5 + x^4 + x^3 + x^2 + x + 1
Phi(12)=x^4 - x^2 + 1
Phi(13)=x^12 + x^11 + x^10 + x^9 + x^8 + x^7 + x^6 + x^5 + x^4 + x^3 + x^2 + x + 1
Phi(14)=x^6 - x^5 + x^4 - x^3 + x^2 - x + 1
Phi(15)=x^8 - x^7 + x^5 - x^4 + x^3 - x + 1
Phi(16)=x^8 + 1
Phi(17)=x^16 + x^15 + x^14 + x^13 + x^12 + x^11 + x^10 + x^9 + x^8 + x^7 + x^6 + x^5 + x^4 + x^3 + x^2 + x + 1
Phi(18)=x^6 - x^3 + 1
Phi(19)=x^18 + x^17 + x^16 + x^15 + x^14 + x^13 + x^12 + x^11 + x^10 + x^9 + x^8 + x^7 + x^6 + x^5 + x^4 + x^3 + x^2 + x + 1
Phi(20)=x^8 - x^6 + x^4 - x^2 + 1
Phi(21)=x^12 - x^11 + x^9 - x^8 + x^6 - x^4 + x^3 - x + 1
Phi(22)=x^10 - x^9 + x^8 - x^7 + x^6 - x^5 + x^4 - x^3 + x^2 - x + 1
Phi(23)=x^22 + x^21 + x^20 + x^19 + x^18 + x^17 + x^16 + x^15 + x^14 + x^13 + x^12 + x^11 + x^10 + x^9 + x^8 + x^7 + x^6
+ x^5 + x^4 + x^3 + x^2 + x + 1
Phi(24)=x^8 - x^4 + 1
Phi(25)=x^20 + x^15 + x^10 + x^5 + 1
Phi(26)=x^12 - x^11 + x^10 - x^9 + x^8 - x^7 + x^6 - x^5 + x^4 - x^3 + x^2 - x + 1
Phi(27)=x^18 + x^9 + 1
Phi(28)=x^12 - x^10 + x^8 - x^6 + x^4 - x^2 + 1
Phi(29)=x^28 + x^27 + x^26 + x^25 + x^24 + x^23 + x^22 + x^21 + x^20 + x^19 + x^18 + x^17 + x^16 + x^15 + x^14 + x^13 + x^12
+ x^11 + x^10 + x^9 + x^8 + x^7 + x^6 + x^5 + x^4 + x^3 + x^2 + x + 1
Phi(30)=x^8 + x^7 - x^5 - x^4 - x^3 + x + 1
Phi(31)=x^30 + x^29 + x^28 + x^27 + x^26 + x^25 + x^24 + x^23 + x^22 + x^21 + x^20 + x^19 + x^18 + x^17 + x^16 + x^15 + x^14
+ x^13 + x^12 + x^11 + x^10 + x^9 + x^8 + x^7 + x^6 + x^5 + x^4 + x^3 + x^2 + x + 1
Phi(32)=x^16 + 1
Phi(33)=x^20 - x^19 + x^17 - x^16 + x^14 - x^13 + x^11 - x^10 + x^9 - x^7 + x^6 - x^4 + x^3 - x + 1
Phi(34)=x^16 - x^15 + x^14 - x^13 + x^12 - x^11 + x^10 - x^9 + x^8 - x^7 + x^6 - x^5 + x^4 - x^3 + x^2 - x + 1
Phi(35)=x^24 - x^23 + x^19 - x^18 + x^17 - x^16 + x^14 - x^13 + x^12 - x^11 + x^10 - x^8 + x^7 - x^6 + x^5 - x + 1
Phi(36)=x^12 - x^6 + 1
Phi(37)=x^36 + x^35 + x^34 + x^33 + x^32 + x^31 + x^30 + x^29 + x^28 + x^27 + x^26 + x^25 + x^24 + x^23 + x^22 + x^21 + x^20
+ x^19 + x^18 + x^17 + x^16 + x^15 + x^14 + x^13 + x^12 + x^11 + x^10 + x^9 + x^8 + x^7 + x^6 + x^5 + x^4 + x^3 + x^2
+ x + 1
Phi(38)=x^18 - x^17 + x^16 - x^15 + x^14 - x^13 + x^12 - x^11 + x^10 - x^9 + x^8 - x^7 + x^6 - x^5 + x^4 - x^3 + x^2 - x + 1
Phi(39)=x^24 - x^23 + x^21 - x^20 + x^18 - x^17 + x^15 - x^14 + x^12 - x^10 + x^9 - x^7 + x^6 - x^4 + x^3 - x + 1
Phi(40)=x^16 - x^12 + x^8 - x^4 + 1
Phi(41)=x^40 + x^39 + x^38 + x^37 + x^36 + x^35 + x^34 + x^33 + x^32 + x^31 + x^30 + x^29 + x^28 + x^27 + x^26 + x^25 + x^24
+ x^23 + x^22 + x^21 + x^20 + x^19 + x^18 + x^17 + x^16 + x^15 + x^14 + x^13 + x^12 + x^11 + x^10 + x^9 + x^8 + x^7
+ x^6 + x^5 + x^4 + x^3 + x^2 + x + 1
Phi(42)=x^12 + x^11 - x^9 - x^8 + x^6 - x^4 - x^3 + x + 1
Phi(43)=x^42 + x^41 + x^40 + x^39 + x^38 + x^37 + x^36 + x^35 + x^34 + x^33 + x^32 + x^31 + x^30 + x^29 + x^28 + x^27 + x^26
+ x^25 + x^24 + x^23 + x^22 + x^21 + x^20 + x^19 + x^18 + x^17 + x^16 + x^15 + x^14 + x^13 + x^12 + x^11 + x^10 + x^9
+ x^8 + x^7 + x^6 + x^5 + x^4 + x^3 + x^2 + x + 1
Phi(44)=x^20 - x^18 + x^16 - x^14 + x^12 - x^10 + x^8 - x^6 + x^4 - x^2 + 1
Phi(45)=x^24 - x^21 + x^15 - x^12 + x^9 - x^3 + 1
Phi(46)=x^22 - x^21 + x^20 - x^19 + x^18 - x^17 + x^16 - x^15 + x^14 - x^13 + x^12 - x^11 + x^10 - x^9 + x^8 - x^7 + x^6
- x^5 + x^4 - x^3 + x^2 - x + 1
Phi(47)=x^46 + x^45 + x^44 + x^43 + x^42 + x^41 + x^40 + x^39 + x^38 + x^37 + x^36 + x^35 + x^34 + x^33 + x^32 + x^31 + x^30
+ x^29 + x^28 + x^27 + x^26 + x^25 + x^24 + x^23 + x^22 + x^21 + x^20 + x^19 + x^18 + x^17 + x^16 + x^15 + x^14
+ x^13 + x^12 + x^11 + x^10 + x^9 + x^8 + x^7 + x^6 + x^5 + x^4 + x^3 + x^2 + x + 1
Phi(48)=x^16 - x^8 + 1
Phi(49)=x^42 + x^35 + x^28 + x^21 + x^14 + x^7 + 1
Phi(50)=x^20 - x^15 + x^10 - x^5 + 1
Évaluations de Phi_n(x) en certains points x
1) Lorsque n est premier, Phi_n(1) = n (par exemple Phi_23(1) = 23).
2) Lorsque n n'est pas premier, Phi_n(1) = 1, (par exemple Phi_24(1) = 1).
3) Le terme constant de Phi_n(x) est 1, on en déduit que Phi_n(b)-1 est divisible par b.
Le polynôme cyclotomique Phi_26(x) = x^12 - x^11 + x^10 - x^9 + x^8 - x^7 + x^6 - x^5 + x^4 - x^3 + x^2 - x + 1 est tel que
Phi_26(1)=1, Phi_26(2) = 2731 nombre premier, Phi_26(3) = 398581 premier, Phi_26(4) = 13421773 = 53 × 157 × 1613 composé, Phi_26(5) = 203450521 = 5227 × 38923 composé etc.
Rangs pour lesquels les évaluations de Phi_n sont des nombres premiers
Pour chaque valeur de x := k = 2, 3, 4, ... on donne les débuts des suites des n (jusqu'à n=500) pour lesquels Phi_n(k) est un nombre premier
x=2
A072226 (Values of n for which Phi_n(2) is prime, where Phi_n is the n-th cyclotomic polynomial.)
2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 19, 22, 24, 26, 27, 30, 31, 32, 33, 34, 38, 40, 42, 46, 49, 56, 61, 62, 65, 69, 77, 78, 80, 85, 86, 89, 90, 93, 98, 107, 120, 122, 126, 127, 129, 133, 145, 150, 158, 165, 170, 174, 184, 192, 195, 202, 208, 234, 254, 261, 280, 296, 312, 322, 334, 345, 366, 374, 382, 398, 410, 414, 425, 447, 471 ...
x=3
1, 3, 6, 7, 9, 10, 12, 13, 14, 15, 21, 24, 26, 33, 36, 40, 46, 60, 63, 70, 71, 72, 86, 103, 108, 130, 132, 143, 145, 154, 161, 236, 255, 261, 276, 279, 287, 304, 364, 430, 464 ...
x=4
1, 2, 4, 6, 8, 12, 16, 20, 28, 40, 60, 92, 96, 104, 140, 148, 156, 300, 356, 408 ...
x=5
3, 7, 10, 11, 12, 13, 24, 28, 47, 48, 49, 56, 57, 88, 90, 92, 108, 110, 116, 120, 127, 134, 141, 149, 161, 181, 198, 202, 206, 236, 248, 288, 357, 384, 420, 458, 500 ...
x=6
1, 2, 3, 4, 6, 7, 8, 18, 21, 22, 24, 29, 30, 42, 50, 62, 71, 86, 90, 94, 118, 124, 127, 144, 154, 192, 214, 271, 354, 360, 411, 480 ...
x=7
5, 6, 13, 18, 21, 28, 30, 34, 36, 46, 48, 50, 54, 55, 58, 63, 76, 84, 94, 105, 122, 131, 148, 149, 224, 280, 288, 296, 332, 352, 456 ...
x=8
1, 3, 9, 30, 42, 78, 87, 138, 189, 303, 318, 330, 408, 462 ...
x=9
6, 12, 18, 20, 30, 36, 54, 66, 118, 138, 152, 182, 232, 264, 336, 340, 380, 414, 446, 492 ...
x=10
2, 4, 10, 12, 14, 19, 23, 24, 36, 38, 39, 48, 62, 93, 106, 120, 134, 150, 196, 317, 320, 385 ...
x=11
9, 10, 14, 15, 17, 19, 20, 27, 36, 42, 45, 52, 60, 73, 91, 104, 139, 205, 234, 246, 318, 358, 388, 403, 458 ...
x=12
1, 2, 3, 5, 10, 12, 19, 21, 22, 56, 60, 63, 70, 80, 84, 92, 97, 109, 111, 123, 164, 189, 218, 276, 317, 353, 364, 386, 405, 456 ...
x=13
5, 6, 7, 12, 22, 24, 28, 33, 34, 38, 78, 80, 102, 137, 140, 147, 224, 230, 283, 304, 341, 360, 372, 384, 418, 420, 436, 483 ...
x=14
1, 3, 4, 7, 14, 19, 24, 31, 33, 35, 36, 41, 60, 106, 114, 129, 152, 153, 172, 222, 265, 286, 400, 448 ...
x=15
3, 6, 14, 24, 43, 54, 58, 73, 85, 93, 102, 184, 220, 221, 228, 232, 247, 291, 305, 486, 487 ...
x=16
2, 4, 6, 8, 10, 14, 20, 30, 46, 48, 52, 70, 74, 78, 150, 178, 204, 298, 306, 346, 366, 378, 400, 476, 498 ...
x=17
3, 5, 7, 11, 12, 14, 15, 34, 46, 47, 48, 50, 71, 77, 94, 114, 147, 154, 176, 228, 235, 258, 275, 338, 350, 419, 450, 480 ...
x=18
1, 2, 6, 14, 24, 30, 33, 45, 46, 72, 78, 114, 146, 168, 288, 414, 440, 448 ...
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