Ondrejka Table 10.O: > Palprimes with prime digits was already out of date and has been considerably extended, in recent days. Harriet Dubner has kindly offered to update it, if I send her a list of what has been done recently. So now's a chance for anyone else who's interested to get a bit of the Ondrejka top-10 action. Even if you can't quite manage to beat today's record: > Primality testing > 3333353535553333333555353533332*R(15600)/R(30)+1 > [N-1, Brillhart-Lehmer-Selfridge] > Calling Brillhart-Lehmer-Selfridge with factored part 31.33% > 3333353535553333333555353533332*R(15600)/R(30)+1 is PRP! [KP proof in progress...] there is a still a good chance to get a mention. It seems to me to be good clean fun to try to displace pure-ECPP work by OpenPFGW work. Frustra fit per plura quod potest fieri per pauciora. [*] At present the best ECPP-only prime-digit paliprime is at 4157 digits. (But bear in mind that this might jump above 7k digits, one fine day.) I can chip in 3 or 4 proofs above 7k digits and it looks as if Ralph is well set to complete a couple more. Anyone else interested in helping to make up an OpenPFGW top-10 above 7k digits, to send to Harriet, now that Ralph has shown us the way to do it? David [*] It is pointless to do with more what can be done with less. Nowadays some tines rendered as: K.I.S.S.

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