mersenneforum.org - View Single Post - Cullen-Williams primes and Woodall-Williams primes

Batalov · 2020-10-25, 23:35

Faster still is to use plain ABC.
ABC2 ($a-1)*$a^($a-1)+1 uses generic FFT.

Instead, run something like this:
cat > a1.abc
ABC $a*$b^$c$d
^D
seq 1 20000 | awk '{print $1-1,$1,$1-1,"+1"}' >> a1.abc
pfgw64 -N -f -l a1.abc

OEIS: 271718 , 191568

2020-10-25, 23:35	#4
Batalov "Serge" Mar 2008 Phi(4,2^7658614+1)/2 9,257 Posts	Faster still is to use plain ABC. ABC2 ($a-1)$a^($a-1)+1 uses generic FFT. Instead, run something like this: cat > a1.abc ABC $a$b^$c$d ^D seq 1 20000 \| awk '{print $1-1,$1,$1-1,"+1"}' >> a1.abc pfgw64 -N -f -l a1.abc OEIS: 271718 , 191568