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There is a sequence described below.What is the missing item?


$5,10,?,50,122,...$

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closed as off-topic by M. Vinay, JonMark Perry, R_D, user186170, callculus May 30 '16 at 11:32

This question appears to be off-topic. The users who voted to close gave this specific reason:

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  • $\begingroup$ I am not sure (since I am not active on that site), but puzzling.SE has a tag for this type of question. So it might be a possible place to ask such questions. (Maybe the experienced users of that site would be able to give better advice on what kind of questions is suitable there.) $\endgroup$ – Martin Sleziak Jun 7 '16 at 14:34
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$2^2+1,3^2+1 , .., 7^2+1, 11^2+1$, seems like series of primes to me so I would guess 26

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It must be zero, and the sequence is, of course, $$5,10,0,50,122,0,5,10,0,50,122,0,5,10,0,\dots$$

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