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References to 'triangular numbers'
1. all positive integers are polite numbers except powers of two by PrimeFan
2. centered hexagonal number by PrimeFan
3. complete graph by vampyr
4. examples of simple recurrence relations by PrimeFan
5. four hundred ninety-six by CompositeFan
6. hexagonal number by PrimeFan
7. lazy caterer's sequence by PrimeFan
8. Nicomachus' theorem by PrimeFan
9. number by pahio
10. number of the beast by CompositeFan
11. oblong number by CompositeFan
12. pairing function by rspuzio
13. Pascal's triangle by Koro
14. Pierre de Fermat by PrimeFan
15. Pietro Mengoli by Mravinci
16. polite number by PrimeFan
17. polygonal number by mathcam
18. small integers that are or might be the largest of their kind by Mravinci
19. Sun's conjecture on sums of primes and triangular numbers by PrimeFan
20. table of polite number representations for $1 < n < 101$ by PrimeFan
21. temporary index 3 of number theory topics by PrimeFan
22. test for hexagonal numbers by PrimeFan
23. tetrahedral number by PrimeFan
24. the difference of two odd squares is always a multiple of 8 by PrimeFan
25. triangular number counting function by PrimeFan
26. trick to sum all the reciprocal triangular numbers by juanman