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Line 8: ==Explicit formulas== ~~Every even number can be written in the form 9n, and every odd number can be written in the form 9n+1.~~ Write {{math\|''N''<sub>''k''</sub>}} for the {{mvar\|k}}th square triangular number, and write {{math\|''s''<sub>''k''</sub>}} and {{math\|''t''<sub>''k''</sub>}} for the sides of the corresponding square and triangle, so that :<math>N_k = s_k^2 = \frac{t_k(t_k+1)}{2}.</math>

Square triangular number: Difference between revisions