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%I A067468 #10 Aug 04 2023 14:10:32
%S A067468 1,20,33,46,59,72,104,117,130,143,175,188,201,214,246,259,272,285,317,
%T A067468 330,343,356,388,401,414,427,459,472,485,498,511,530,543,556,569,582,
%U A067468 614,627,640,653,685,698,711,724,756,769,782,795,827,840,853,866,898
%N A067468 Numbers n such that 7 is the first digit of 7^n.
%t A067468 Select[Range[1000],IntegerDigits[7^#][[1]]==7&] (* _Harvey P. Dale_, Aug 04 2023 *)
%o A067468 (PARI) : for(n=1,1000, if(floor(7^n/10^(floor(n*log(7)/log(10))))==7,print1(n,",")))
%Y A067468 Cf. A067485.
%K A067468 nonn,base
%O A067468 1,2
%A A067468 _Benoit Cloitre_, Feb 22 2002

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