Quote:
Under Rule 3:
With M23 as Mz, a +/ b = 1221 or 1323, while c +/ d = 5258 or 5274
There's no equality, so I guess M11213 isn't in the range to be a candidate for M23, huh?

For M11213, the good formula is a + b = c +d = 5184 , and the bracket is 1019315125 , with a gap of 4932, soit Y37Y36 on the spreadsheet.
Otherwise, it's true that the member "2e", on the rule IVb, is from recent apparition (around M38).
I can nothing if there is a "resserrement" of the last values in the sequence.