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 A067468 #13 Apr 26 2025 20:10:02 %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