Filter continuous numbers ..formula

[poetbil]

Let's say we have a list of numbers

A B C D E .....
1 1 4 15 17 17 18 20 21 30 34 35 35
2
3
4
5

how could i filter continuous numbers ,so I ll leave,the most
o n l y 1 pair of continuous numbers

I need this for a LOTTO number generator with some conditions
i need a formula
Thanks for your kindness

 

[poetbil]

maybe a formula ..
IF(OR(abs(A1-b1)>1,OR... etc etc

Finally SOLVED ,this was the road

thanks