Open sx349 opened 2 years ago
https://pe-cn.github.io/799/
Problem 799 Pentagonal PuzzlePentagonal numbers are generated by the formula: $P_n = \tfrac{1}{2} n(3n-1)$ giving the sequence: $$1,5,12,22,35, 51,70,92,\ldots $$ Some pentagonal numbers can be expre
https://pe-cn.github.io/799/
Problem 799 Pentagonal PuzzlePentagonal numbers are generated by the formula: $P_n = \tfrac{1}{2} n(3n-1)$ giving the sequence: $$1,5,12,22,35, 51,70,92,\ldots $$ Some pentagonal numbers can be expre