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 A226795 #5 Feb 18 2021 21:28:12
%S A226795 1,4,5,8,25,29,41,44,65,172,176,212,365,368,389,536,1201,1205,1241,
%T A226795 1565,3281,3284,3305,3452,4481,8404,8408,8444,8768,11684,29525,29528,
%U A226795 29549,29696,30725,37928,58825,58829,58865,59189,62105,88349,265721
%N A226795 Numbers of the form (7^j + 9^k)/2, for j and k >= 0.
%t A226795 a = 7; b = 9; mx = 600000; Union[Flatten[Table[a^n + b^m, {m, 0, Log[b, mx]}, {n, 0, Log[a, mx - b^m]}]]]/2
%o A226795 (PARI) list(lim)=my(v=List(),J,K); lim=(lim\1)*2; for(j=0,logint(lim-1,7), J=7^j; K=1; while(J+K<=lim, listput(v,(J+K)/2); K*=9)); Set(v) \\ _Charles R Greathouse IV_, Feb 18 2021
%Y A226795 Cf. A226831 (7^j + 9^k).
%K A226795 nonn,easy
%O A226795 1,2
%A A226795 _T. D. Noe_, Jun 19 2013