recently i was reading up on crytpography and general encoding etc and stumbled across a little challenge ! it took me 2 hours to work it out, is anyone here quicker ??? i am sure there is !

2,4,6
30,32,34,36
40,42,44,46
50,52,54,56
60,62,64,66

What is the next sequence of numbers and why ?

happy deciphering peeps !