self Maths Puzzle

3,7,31,151,911,__

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self Other Question

An old woman is carrying some no. of eggs in a pot and on the same way a person rashly driving his Motor-Bike and damaged her pot and all the eggs are spoiled . Then she went for justice to the President of that village. There she said that she dont know the total number, but at her home, when divide them into 7 equqal parts no eggs remain odd, if it is 6 equal parts - 5 eggs remain, 5 equal parts - 4 eggs remain, 4 equal parts - 3 eggs remain, 2 equal parts - 1 egg remain.
At starting How many eggs She has?
what is difference between infinity and undefined