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A375246
Number of biquadratefree numbers <= 10^n.
2
1, 10, 93, 925, 9240, 92395, 923939, 9239385, 92393839, 923938406, 9239384029, 92393840300, 923938402926, 9239384029211, 92393840292169, 923938402921591, 9239384029215891, 92393840292159004, 923938402921590127, 9239384029215901651, 92393840292159016603
OFFSET
0,2
COMMENTS
Digits of terms converge to digits of 1/zeta(4) = 90/Pi^4 (A215267).
LINKS
FORMULA
a(n) = A375245(10^n).
PROG
(Python)
from sympy import mobius, integer_nthroot
def A375246(n): return int(sum(mobius(k)*(10**n//k**4) for k in range(1, integer_nthroot(10**n, 4)[0]+1)))
CROSSREFS
KEYWORD
nonn
AUTHOR
Chai Wah Wu, Aug 07 2024
STATUS
approved