This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A147800 #10 Aug 11 2020 09:47:51
%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.
%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) = {my(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 (analog for 2^n), A147801 (analog for 3^n), A147298 (general case).
%K A147800 nonn,more
%O A147800 1,1
%A A147800 _M. F. Hasler_, Nov 13 2008