Math 2.0

Concept

Doubly triangular number

Summary

In mathematics, the doubly triangular numbers are the numbers that appear within the sequence of triangular numbers, in positions that are also triangular numbers. That is, if Tn=n(n+1)/2T_n=n(n+1)/2 denotes the nnth triangular number, then the doubly triangular numbers are the numbers of the form TTnT_{T_n}.

Further reading

  1. Wikipedia, page 66308569, revision 1352114900, Doubly triangular number. adopted
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Changed4 November 2026

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