self Maths Puzzle

find next term
"1,3,9,31,129,?"

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self Other Question

can you know any two number of all ones when multiplied and added should give the same answer. (example 1 and 11 when multiplied gives 11, addition gives 12 this also not provide same answer)find the two numbers which satisfies this condition. 3,20,63,144,275 ?