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%I #10 Feb 12 2022 18:43:26
%S 1,4,68719476736,
%T 95780971304118053647396689196894323976171195136475136,
%U 25108406941546723055343157692830665664409421777856138051584,1606938044258990275541962092341162602522202993782792835301376
%N Powers of 4 with digit sum also a power of 4.
%C The next term (a(6)) has 915 digits. - _Harvey P. Dale_, Feb 12 2022
%t Select[4^Range[0,100],IntegerQ[Log[4,Total[IntegerDigits[#]]]]&] (* _Harvey P. Dale_, Feb 12 2022 *)
%Y Cf. A067499, A067500.
%K nonn,base
%O 0,2
%A _Amarnath Murthy_, Feb 11 2002
%E More terms from _Sascha Kurz_, Mar 18 2002
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