Pennriv yw niver naturel nag yw digolm a m × n pan yw m ha n niverow naturel ha nyns yw 1 ny m ny n.
Nyns yw 1 pennriv, ha nyns eus an brassa pennriv.
An kynsa niverow yw: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 83, 89, 97, 101,...
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