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A067205
Least numbers with n = digital root = number of prime factors.
0
19, 38, 12, 40, 32, 96, 448, 1664, 1152
OFFSET
1,1
COMMENTS
For 1 <= n <= 9: A010888(a(n)) = A001222(a(n)) = n.
EXAMPLE
a(7)=448 as A001222(448)=7 because of 448=2*2*2*2*2*2*7
and A010888(448)=7 because of 4+4+8=16 and 1+6=7.
CROSSREFS
Cf. A007953.
Sequence in context: A144594 A287310 A123028 * A196185 A040342 A164009
KEYWORD
nonn,base,fini,full
AUTHOR
Reinhard Zumkeller, Feb 19 2002
STATUS
approved