This will lead you to a new page displaying additional information about the referenced triangulars. My first idea was to incorporate them also in the table, but that would have lead to an overloaded table difficult to manage. All the EVEN palindromic triangulars carry the factor 11 in their genes. And 11 is the only existing palindromic prime with an 'even' number of digits. By the way counting up all three pairs generates the number of the beast nl.
Some triangular numbers have close family ties.
They share the same starting and ending sequence. They seem to grow like crystals. There exist a sequence of precisely 1.000 digits which includes all the numbers of 1 to 1.000 as substrings. My list with more than hundred examples proves overwhelmingly that Mr. Wells is wrong on this point.