Cyclotomic primes (degree>=5)
 

[QUOTE=Batalov;397246][COLOR=Blue]P.S. Another one is Phi[SUB]7[/SUB](p) (i.e. p[SUP]6[/SUP]+p[SUP]5[/SUP]+p[SUP]4[/SUP]+p[SUP]3[/SUP]+p[SUP]2[/SUP]+p+1), where p=5978493*2^150006-1. With 270979 decimal digits, it is a bit short of entering the UTM prime database.[/COLOR][/QUOTE]
I decided to give another try to the search of Phi[SUB]7[/SUB](x) primes.

I modified NewPGen to simultaneously sieve for p=kb[SUP]n[/SUP]-1 and Phi[SUB]7[/SUB](p) and Phi[SUB]7[/SUB](-p-1) (fixed n, sieve for k).
After sieving to 16T, llr/pfgw becomes faster for testing p values of which one would like to find 10-15 thousand...