Chwech
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| Enghraifft o: | 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, antisquare number  |
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 Ffeiliau perthnasol ar Gomin Wicimedia | |
