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Nombre premier 67. — Racines primitives 2, 7, 11, 12, 13, 18, 20, 28, 31, 32, 34, 41, 41, 46, 48, 50, 51, 57, 61, 63. - Base 12.

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Nombre premier 71. — Racines primitives 7, 11, 13, 21, 22, 28, 31, 33, 35, 42, 44, 47, 52, 53, 55, 56, 59, 61, 62, 63, 65, 67, 68, 69. - Base 62.

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Nombre premier 73. — Racines primitives 5, 11, 13, 14, 15, 20, 26, 28, 29, 31, 33, 34, 39, 40, 42, 44, 45, 47, 53, 58, 59, 60, 62, 68.— Base 5.