What should come in place of question mark (?) in the following number series ?
31, 35, 44, 60, 85, ?
The pattern here followed is :
31 + $$2^2$$ = 35
35 + $$3^2$$ = 44
44 + $$4^2$$ = 60
60 + $$5^2$$ = 85
85 + $$6^2$$ = 121
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