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 A375246 #12 Aug 09 2024 10:07:56 %S A375246 1,10,93,925,9240,92395,923939,9239385,92393839,923938406,9239384029, %T A375246 92393840300,923938402926,9239384029211,92393840292169, %U A375246 923938402921591,9239384029215891,92393840292159004,923938402921590127,9239384029215901651,92393840292159016603 %N A375246 Number of biquadratefree numbers <= 10^n. %C A375246 Digits of terms converge to digits of 1/zeta(4) = 90/Pi^4 (A215267). %H A375246 Chai Wah Wu, <a href="/A375246/b375246.txt">Table of n, a(n) for n = 0..39</a> %F A375246 a(n) = A375245(10^n). %o A375246 (Python) %o A375246 from sympy import mobius, integer_nthroot %o A375246 def A375246(n): return int(sum(mobius(k)*(10**n//k**4) for k in range(1, integer_nthroot(10**n,4)[0]+1))) %Y A375246 Cf. A060431, A013662, A046100, A215267, A307430, A375245. %K A375246 nonn %O A375246 0,2 %A A375246 _Chai Wah Wu_, Aug 07 2024