Solution
Given series follows a pattern described below:
121 = $$11^{2}$$
144 = $$12^{2}$$
289 = $$(12+5)^{2}$$
324 = $$(18)^{2}$$
529 = $$(18+5)^{2}$$
576 = $$(24)^{2}$$
So next number will be $$(24+5)^{2}$$ = 841
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