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Line 59: which is an instance of [[Pell's equation]]. This particular equation is solved by the [[Pell number]]s {{math\|''P''<sub>''k''</sub>}} as<ref> {{cite book \|last1=Hardy \|first1=G. H. \|authorlink1=G. H. Hardy \|last2=Wright \|first2=E. M. \|authorlink2=E. M. Wright \|title=An Introduction to the Theory of Numbers \|edition=5th \|year=1979 \|publisher=Oxford University Press \|isbn=0-19-853171-0 \|page=[https://archive.org/details/introductiontoth00hard/page/210 210] \|quote=Theorem 244 \|url-access=registration \|url=https://archive.org/details/introductiontoth00hard/page/210 }} </ref>

Square triangular number: Difference between revisions