Smallest prime whose digital sum is equal to the n-th composite number not congruent to 0 (modulo 3).
13, 17, 19, 59, 79, 389, 499, 997, 1889, 1999, 6899, 17989, 8999, 39989, 49999
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Sun Nov 14 22:42:15 CET 2010 [seqfan] OEIS: what went wrong