3 and 4 are informally called hell levels sometimes just because they can be painful on some classes, not because you actually need to kill more monsters to level.
The wiki has a definitive guide on hell levels, but basically, to reiterate and expand on what Tecmos said:
30, 35, 40, and 45 require you to kill approximately twice as many monsters to level as other levels. Also, on the level after a hell level, you will lose approximately twice as much EXP on death (not viewed as a number, but viewed as % to level up, i.e. the yellow bar) as other levels. Also, after a hell level, your overall leveling speed will slow a little. (This is actually the point of them: to increase how many monsters you have to kill per level. But the original EQ devs were bad at math and made it so that you actually have to kill a ton more monsters when that transition happens (the hell levels) in addition to having to kill a few more from then on.)
Then, levels 51+ are all hell levels, but 54 and 59 are double hell levels (it'll take you roughly twice as many monster kills at 51 as at 50 to level up, and roughly twice as many at 54 or 59 than at the previous levels). For simplicity people usually just say that 54 and 59 are hell levels, it being understood that 51+ is much slower in general.
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