Timeline for The sequence $a_{n+1}=$ the greatest prime factor of $(xa_n+y)$
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
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| Feb 14, 2012 at 6:30 | comment | added | joro | Gerhard, web search showed that the longest prime AP is 26 and the Cunningham chain (of second kind 2p-1) is 17. For the AP a distributed project was used - Primegrid, so CPU time spent might have influenced the records: en.wikipedia.org/wiki/Primes_in_arithmetic_progression | |
| Feb 13, 2012 at 17:04 | comment | added | Gerhard Paseman | Another open problem is regarding Cunningham chains, which involve generating primes using 2p+1 as the iterate. It would be of interest to me if one could find x > 1 and y that produce longer chains than the known chains and progressions (22 if memory serves). Gerhard "Ask Me About System Design" Paseman, 2012.02.13 | |
| Feb 12, 2012 at 19:40 | history | edited | joro | CC BY-SA 3.0 |
typo GPF
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| Feb 12, 2012 at 18:29 | history | edited | joro | CC BY-SA 3.0 |
Clarified
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| Feb 12, 2012 at 18:08 | history | answered | joro | CC BY-SA 3.0 |