%I A147800
%S A147800 2,6,22,42,222,366,2046,13962,10626,79926,293262
%N A147800 Minimal value of A007947(m(5^n-m)) with m coprime to 5.
%C A147800 The minima are reached for m values given in A147803.
%C A147800 This is related to the abc conjecture, see also A143702, A147801 (2^n, 
               3^n analogues) and A147298 (general case).
%C A147800 All terms of this sequence are even, so one could also consider A147800/
               2 = 1, 3, 11, 21, 111, 183, 1023, 6981, 5313, 39963, 146631,...
%o A147800 (PARI) A147800(n,p=5)={local(m=n=p^n);for(a=1,(n-1)\2,a%p|next;A007947(n-a)*A007947(a)<m|next;
               m=A007947((n-a)*a));m}
%Y A147800 Cf. A007947, A147803 (m values), A143702 (analogue for 2^n), A147801 
               (analogue for 3^n), A147298 (general case).
%Y A147800 Sequence in context: A129534 A085286 A062085 this_sequence A027561 A126171 
               A002839
%Y A147800 Adjacent sequences: A147797 A147798 A147799 this_sequence A147801 A147802 
               A147803
%K A147800 more,nonn
%O A147800 1,1
%A A147800 M. F. Hasler (MHasler(AT)univ-ag.fr), Nov 13 2008