Question
What are the missing numbers?
3051, (a)          , 3131, 3171, (b)          , 3251
2 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

What are the missing numbers?
3051, (a)          , 3131, 3171, (b)          , 3251