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 A151785 #20 Jul 29 2023 03:28:15 %S A151785 1,1,7,1,7,7,49,1,7,7,49,7,49,49,343,1,7,7,49,7,49,49,343,7,49,49,343, %T A151785 49,343,343,2401,1,7,7,49,7,49,49,343,7,49,49,343,49,343,343,2401,7, %U A151785 49,49,343,49,343,343,2401,49,343,343,2401,343,2401,2401,16807,1,7,7,49,7,49 %N A151785 a(n) = 7^(wt(n) - 1) where wt(n) is the binary weight of n (A000120). %H A151785 Amiram Eldar, <a href="/A151785/b151785.txt">Table of n, a(n) for n = 1..10000</a> %t A151785 7^(DigitCount[Range[70],2,1]-1) (* _Harvey P. Dale_, Feb 15 2015 *) %Y A151785 Cf. A000120, A000420. %K A151785 nonn %O A151785 1,3 %A A151785 _N. J. A. Sloane_, Jun 25 2009