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%I #10 Aug 15 2017 03:15:02
%S 1,7,2401,1977326743
%N Powers of 7 with digit sum also a power of 7.
%C Next terms are 7^4433, 7^30810. - _Sascha Kurz_, Mar 18 2002
%Y Cf. A067499, A067500, A067501, A067502, A067503.
%Y Subsequence of A000420.
%K base,easy,nonn
%O 1,2
%A _Amarnath Murthy_, Feb 11 2002