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A075863
phi(phi(n)) = sum of prime factors of n.
+0
1
8, 45, 55, 95, 126, 132, 198, 215, 228, 516, 2855, 6852, 7655, 18372
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 4 23:11 EST 2009. Contains 170347 sequences.
AT&T Labs Research
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