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Number of the form $$(2^n + 1)$$ are added where n is even number
9 $$+ (2^0 + 1)$$ = 11
11Â $$+ (2^2 + 1)$$ =Â 16
16Â $$+ (2^4 + 1)$$ =Â 33
33Â $$+ (2^6 + 1)$$ =Â 98
98Â $$+ (2^8 + 1)$$ =Â 355
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