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%I #5 Dec 05 2013 19:57:03
%S 0,2,3,31,41,0,421,521,0,4231,5231,0,7321,8231,0,64231,74231,0,94321,
%T 431021,0,754123,854213,0,5431021,6421013,0,8431021,9431021,0,
%U 65412103,75411023,0,95421103,96412103,0,643110211,765324101
%N Largest prime obtained by concatenation of parts of a distinct partition of n. 0 if no such number exist.
%C Conjecture a(n) = 0 only for n = 1, or n == 0 (mod 3), n is > 3. Subsidiary sequence (hard): Number of primes generated by concatenation of distinct partitions of n.
%e Distinct partitions of 10 are 10,(9,1), (8,2), (7,3),...(7,2,1),(6,3,1),(5,3,2),...(4,3,2,1), etc. (4231 is the largest number obtained as a concatenation of (4,2,3,1).
%e a(10)=4231.
%K base,nonn
%O 1,2
%A _Amarnath Murthy_, Aug 04 2005
%E Corrected and extended by _R. J. Mathar_, Feb 08 2008
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