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A109671
Numbers n > 1 written "as is" if prime or as a concatenation of the prime divisors of n if n is composite.
+0
1
2, 3, 22, 5, 23, 7, 222, 33, 25, 11, 223, 13, 27, 35, 2222, 17, 233, 19, 225, 37, 211
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Maintained by
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Last modified December 6 13:11 EST 2009. Contains 170427 sequences.
AT&T Labs Research
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