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References to 'polygonal number'
1. centered hexagonal number by PrimeFan
2. examples of digital roots in a few selected bases by PrimeFan
3. hexagonal number by PrimeFan
4. oblong number by CompositeFan
5. pentagonal number theorem by bbukh
6. Pierre de Fermat by PrimeFan
7. Sun Zhiwei by Mravinci
8. test for hexagonal numbers by PrimeFan