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number puzzle

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kuriouskat | 05:09 Wed 29th Nov 2006 | Quizzes & Puzzles
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the firsnumber is2 5 26 what is the next number and why
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I have this explanation from another site I frequent and dont ask me to explain it I failed mathematics big time.

think the progression is (n^2 + 1) eg 5 = 2^2 +1, 26 is 5^2 +1 and so on.

If I'm right, the next number is 677.
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thank you i think i have worked it out

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