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Old 2020-10-25, 23:35   #4
Batalov
 
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"Serge"
Mar 2008
Phi(4,2^7658614+1)/2

9,257 Posts
Lightbulb

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
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