Chwech
Gwedd
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, semiprime |
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