Chwech

Data cyffredinol
Enghraifft o'r canlynol	rhif naturiol, perfect number, rhif triongl, automorphic number, rhif cyfansawdd, eilrif, centered pentachoric number, centered pentagonal number, hexagonal number, pentagonal pyramidal number, pronic number, highly touchable number, strictly non-palindromic number, harshad number
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Rhif rhwng pump a saith yw chwech (6).

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