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 A362935 #11 Aug 29 2023 10:12:04 %S A362935 0,0,1,1,3,5,8,10,12,16,21,25,31,37,44,48,56,62,71,79,89,99,110,120, %T A362935 128,140,151,163,177,191,206,218,234,250,267,279,297,315,334,352,372, %U A362935 392,413,433,453,475,498,518,536,556,581,605,631,655,682,708,736,764,793,821,851,881,910,934,966,998 %N A362935 a(n) = (A000982(n) - A132188(n))/2. %C A362935 a(n) = one-half of (number of pairs (i,j) in [1..n] X [1..n] with integral arithmetic mean) - (number of pairs (i,j) in [1..n] X [1..n] with integral geometric mean). %H A362935 Alois P. Heinz, <a href="/A362935/b362935.txt">Table of n, a(n) for n = 1..10000</a> %F A362935 a(n) = A362934(n)/2. %o A362935 (Python) %o A362935 from sympy.ntheory.primetest import is_square %o A362935 def A362935(n): return ((n-1)**2>>2)-sum(1 for x in range(1,n+1) for y in range(1,x) if is_square(x*y)) # _Chai Wah Wu_, Aug 29 2023 %Y A362935 Cf. A000982, A132188, A362931-A932937. %K A362935 nonn %O A362935 1,5 %A A362935 _N. J. A. Sloane_, Aug 28 2023