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The series goes like this........

15, 12+52=26, 22+62=40, 42+02=16, 12+62=37, 32+72=58,

52+82=89,...........I guess now u know the next term which is....82+92=145

So its the series of sum of squares of the digits of previous term.

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12y ago

What else can I help you with?