1981
1981 — 1980 биле 1982 деп саннар аразында турар сан.
| 1981 | |
| ← 1979 · 1980 · 1981 · 1982 · 1983 → | |
|---|---|
| Факторизация | 7 · 283 |
| Рим чурагайлар | MCMLXXXI |
| Ийилээр система | 11110111101 |
| Сестээр система | 3675 |
| Он алдылаар система | 7BD |
| Алыс сан | |
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