Square triangular number: Difference between revisions

Revision as of 17:38, 15 April 2021

Revision as of 17:45, 15 April 2021

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The [[Digital root]] of every Square triangular number (expect 0) is 1 if the number has a even indexplace in the series and 9 if it has odd indexplace.

*That can written as:

:<math>DR(N_k)= 8 (k % 2)+1</math> (with the expection of <math>DR(N_0)=0</math>)

==Numerical data==