Bear in mind that that's the probability of rolling any set of seven numbers. 1,13,17,4,6,19,8 is just as improbable a sequence.
Remember also that you have to bear in mind how many times they've rolled d20s. And how many other combinations would cause a "what the!?" reaction. Million-to-one chances happen to six thousand people a day.*
* Not precisely, of course. But I lack the statistical knowledge to be more correct here.