Wikidata entity: Q28372677
| P4224 | category contains | ... | Q245102 (triangular number) | triangular number |
| P301 | category's main topic | ... | Q245102 (triangular number) | triangular number |
| P373 | Commons category | String | Triangular numbers | ??? |
| P31 | instance of | ... | Q4167836 (Wikimedia category) | Wikimedia category |
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