Timeline for When are there infinitely many primes in a sequence generated by a simple recurrence relation?
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| Dec 29, 2016 at 18:07 | comment | added | Kevin Buzzard | Right, but this involves the insight that one can greatly cut down on the possibilities for $n$ for which $2^n+1$ can be prime. I learnt in 2009 (and again today) that $2^n+9262111$ is only prime finitely often but I can't see how to make your heuristics apply here. | |
| Dec 29, 2016 at 16:19 | history | answered | user40023 | CC BY-SA 3.0 |