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Old 2018-01-24, 21:44   #2
Dubslow
Basketry That Evening!
 
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"Bunslow the Bold"
Jun 2011
40<A<43 -89<O<-88

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http://factordb.com/index.php?query=3%5E19217-2

It was proven prime in July 2015 by a member of this forum.

He probably used the Primo software for it.

It's not too difficult to establish the compositeness (or lack thereof) of such small numbers. Even using Python and a naively-simple implementation of the Euler PRP test or Miller-Rabin test can quickly establish that it is a least a pseudo-prime (or composite for other similar sized numbers) in a minute or two on a now-slow Sandy Bridge laptop.

For all further efforts, I highly recommend using the FactorDB as your launching point.

Last fiddled with by Dubslow on 2018-01-24 at 21:48
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