Bertie
Updating my earlier posts #9 and #10, the sequence for m is
6,9,12,15, (as in #9)
then 19 (an increase of 4 which caused me to write #10 because I thought #9 was wrong),
but it then continues
22,25,28,31,34, (steps of 3)
38 (step of 4)
41,44,47,50,53, (steps of 3)
57 (step of 4)
60,63,66,69,72, (steps of 3)
76 (step of 4).
i.e. five steps of 3 then one step of 4.
Whether or not this pattern continues indefinitely I don't know.
-Bertie